Thank you I want something better than Convoy's drivers. What should I get that has decent regulation? One other question, does that 8A buck driver from Convoy offer better regulation? I'm not familiar with buck drivers
Speaking of regulation, it's either regulated or not. So, if the driver is regulated that's what it will do. Linear or buck drivers cannot boost voltage, only reduce it. In the case of linear drivers like the one you linked above (found it here too) or Simon's newer drivers (all of them are dubbed or advertised for SST40, by the way), any excess voltage and current is burned by the driver in its MOSFETs; the driver senses outgoing current in its sense resistor, this happens because when current goes through the resistor it causes a voltage drop in the sense resistor terminals which is amplified by a current sense amplifier (it amplifies the sense voltage at the resistor terminals) and fed into the MCU. The MCU uses this information to precisely adjust the MOSFETs' VGS; this controls the resistance of the MOSFETs to the flow of current, i.e. uses the MOSFETs in linear mode, and this way it can precisely control how much current is flowing (think of electricity like a gas, and imagine the MOSFETs are like a gas valve, and the MCU is someone who opens the valve just enough for the required amount of gas to flow). When less than the maximum allowable current is sensed, the MOSFETs are of course driven “all the way” or in saturation mode (in this case the amount of gas pressure is not enough and the MCU just fully opens the gas valve).
The newest single cell 8A buck driver from Convoy is a very smart choice, because it is a switching driver. This means it does not burn excess voltage (times current which is power) as heat in the board, instead it uses a buck converter to efficiently and precisely adjust the voltage to the led for the required amount of current to flow (sensed with a sense resistor, of course). The reason for such a powerful buck converter in limited space is that it is meant for single cell operation, and thus it is not necessary to employ a much bigger inductor which would be required for it to work with 2S cells input.
If you can swap sense resistors in drivers, adjusting the sense resistor value has a direct effect on the amount of current the driver handles. As an example, Simon's Ø22mm 6A drivers (this or that). They are meant for 6A maximum driving current and employ a 10mΩ sense resistor (R010); this means V = I × R = 6A × 10mΩ = 60mV of sense voltage (in case you are wondering, the current to the emitter entirely goes via the sense resistor). Knowing the sense voltage we can re-calculate the sense resistor value for a different current. Since you'd like to increase current, you could stack another sense resistor atop the one in the driver (more conductance) to raise the current. How much? Well, for +1A let's do the math: R = V / I = 60mV / 1A = 60mΩ; this one was easy. On top of this, I just found an advertisement which precisely sells 2010 imperial 62mΩ sense resistors here, which is super close. Proper driver cooling is recommended if raising its limits, namely if you do away with temperature regulation (removing the onboard NTC). I can understand, though, that modifying a driver requires certain tools and skill.
Back on CULPM1.TG issues, I find somewhat surprising these underperforming CULPM1.TG units. Must be some bad bin. Got them from Shenzhen silver ingot Technology Co., Ltd. in AliExpress?
By the way, the CSLPM1.TG is about less than half the price of the CULPM1.TG, what gives?
I have a thrower with a CSLPM1.TG driven at 6.5A or so, I built it for someone else but needs a repair. Nice to see that I chose a proper driving current for it.
—
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I’m confused too at some point with those tests from Funtastic.
As Barkuti mentioned, surprised to see that the CULPM1 performed worse than the CSLPM1 when the CULPM1 is higher Spec. As in djozz test for CSLPM1 peak at 7.5amp while Funtastic CULPM1 peak at 7amp…????
I’m confused too at some point with those tests from Funtastic.
As Barkuti mentioned, surprised to see that the CULPM1 performed worse than the CSLPM1 when the CULPM1 is higher Spec. As in djozz test for CSLPM1 peak at 7.5amp while Funtastic CULPM1 peak at 7amp…????
I only tested 6A, 7A, 8A, and 7A saw the best performance. 8A had only 5 lumens more.
djozz did tell me his test was also 7A and that he wasn’t impressed at all.
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Texas Ace Lumen Tube calibrated with maukka lights
I’m confused too at some point with those tests from Funtastic.
As Barkuti mentioned, surprised to see that the CULPM1 performed worse than the CSLPM1 when the CULPM1 is higher Spec. As in djozz test for CSLPM1 peak at 7.5amp while Funtastic CULPM1 peak at 7amp…????
I only tested 6A, 7A, 8A, and 7A saw the best performance. 8A had only 5 lumens more.
djozz did tell me his test was also 7A and that he wasn’t impressed at all.
Yes Funtastic… saw all you posts and tests.. Good reference. Thanks…
Thanks for that write up Barkuti, I need to read it a couple more times to understand all of it. I wasn’t familiar with Ohm’s Law so I was scratching my head wondering what the letter “I” meant until I input that formula into google haha.
The CULPM1 leds are from Convoy. I have been using the 7A ramping driver as I’m unsure how good it is to drive them with that 8A driver. There’s no tint shift at 8A so that’s a good sign anyway.
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Texas Ace Lumen Tube calibrated with maukka lights
I’m still planning to.A few months ago I have already tested a sample that Hank sent me (it tested not revolutionarily better than the 3030 version, seemed a low bin to me), and I have one that I bought from Simon that still needs testing. One of these days…
I’m hoping it can handle a fet driver. There’s a video on youtube of it running on the A17DD-L FET+1
Hank’s sample had 95% of max output at 7A/3.23V, its max at 9A/3.32V/1500lm and was still alive at 12A/3.47V (with 80% of the max output).
So if you run the led with a high drain 18650 on a direct driver while keeping resistances low, the current will almost certainly go over 9A and the led is run over its max, and you might not even notice that because the output is still high.
On the other hand, if you introduce some resistance here and there (a bit less high drain cell, an un-bypassed spring) you might hit the 7A sweetspot while still using a FET driver.
I do not expect the curves of Simon’s Boost HX leds to really differ from this, but I hope that they are a bit better bin, so that you can actually see the advantage of the 4040 footprint over the 3030 footprint.
9A max but that’s not what I’m getting on the ones I received from Convoy
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Texas Ace Lumen Tube calibrated with maukka lights
Have you described your testing process in detail? If you are trying to get down to that level of precision you should work those details out too.
I’m just using Convoy’s ramping driver
Top three were in the L21A, bottom one in the C8+ , the only difference in the setup is the L21A tail switch. It’s a fet driver so I do understand it’s not going to be the same across all leds but should it be that much? I’ve never had it vary so much on other models using the same springs and batteries
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Texas Ace Lumen Tube calibrated with maukka lights
In that case I think there are a bit too many variables to get more than a rough average which I think you succeeded in. Certainly not enough precision to worry about reflow though.
Unless you use a power supply and heavy duty heatsink combined with more consistent measure like bare LED using lux not lumens. This is why djozz and others get so burnt out doing it. That level of detail necessary is a pain in the butt.
I'm starting to feel that Convoy has a badly reflowed batch of CULPM1 chips or these just have a lot difference between each.
…
led 1 - 7A - 1135
led 2 - 7A - 1300
led 3 - 7A - 1250
led 4 - 6.4A - 1320, 7A - 1280
…
Funtastic wrote:
… I'm just using Convoy's ramping driver
Top three were in the L21A, bottom one in the C8+ , the only difference in the setup is the L21A tail switch. It's a fet driver so …
Sorry?
What is a FET driver?
As far as I understand, what is considered a (MOS)FET driver is a sort of very simple driver basically consisting of a switch and an MCU. These drivers are unregulated and the only way to obtain modes with them is to use the dreaded PWM (pulse width modulation). To attain regulation the flow of current must be sensed, this is done in a current sense resistor, usually a big sized, ultra-low value resistor in the periphery of the driver board:
A 1206 imperial R005 in this one.
So, technically speaking this is not a “FET” driver. These drivers are regulated, they make use of the voltage they sense via their sense resistor to trigger events in their MCU, that is, they use such information to drive the MOSFET gate so the required amount of current goes through the sense resistor (i.e. they open the switch “just enough”).
—
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Ah, okay. I appreciate the correction. I struggle quite a bit to understand how components work when it’s something new in writing, I learn best visually.
Now I realize that the driver I’m after is one that has stabilization, would that be constant current or something else? What we see usually on boost drivers.
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Texas Ace Lumen Tube calibrated with maukka lights
Tom E, you may want to fix the nicknames back there: if the NM1 and PM1 are Wn, where n = die area in mm², then the Boost HL and HX which are their bigger footprint counterparts should be dubbed Wn.something, W1+ for the KW CULNM1.TG and W2+ for the KW CULPM1.TG, for example. You could also add some proper, simple surnames to the color variants for the sake of simplicity (just remember that the pure green is the phosphor converted green, with some CRI, despite being listed with a narrow frequency window versus the true green).
Just a suggestion.
—
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Please avoid fully quoting lenghty posts, namely with nested quotes. Trim quotes down to the essential. Helps with neatness and legibility. Thanks.
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The newest single cell 8A buck driver from Convoy is a very smart choice, because it is a switching driver. This means it does not burn excess voltage (times current which is power) as heat in the board, instead it uses a buck converter to efficiently and precisely adjust the voltage to the led for the required amount of current to flow (sensed with a sense resistor, of course). The reason for such a powerful buck converter in limited space is that it is meant for single cell operation, and thus it is not necessary to employ a much bigger inductor which would be required for it to work with 2S cells input.
It’s a small indutance value of 0.47uH, the smaller the inductance the smaller the DCR usually, which is another reason you want a small inductance value in such small place, to actually minimize DCR at high currents.
Still it is small inductor, low profile, I cannot imagine constant current at 8A, for lower currents like 3A surely no problems. I would like to see a review with a flashlight, without artificial active cooling.
Otherwise it seems to look good for example appears like a couple of external FETs rather than integrated into the switching IC.
Tom E, you may want to fix the nicknames back there: if the NM1 and PM1 are Wn, where n = die area in mm², then the Boost HL and HX which are their bigger footprint counterparts should be dubbed Wn.something, W1+ for the KW CULNM1.TG and W2+ for the KW CULPM1.TG, for example. You could also add some proper, simple surnames to the color variants for the sake of simplicity (just remember that the pure green is the phosphor converted green, with some CRI, despite being listed with a narrow frequency window versus the true green).
Don't think it's the best, but thought Hank was following other conventions.
I'm keeping this is a Word docx file for now. Will make it public when it's more finalized. I've learned a few things since putting this together. The different flavors always had me confused somewhat. For white, looks like the Boost HL and Boost HX are making the old W1 and W2's obsolete, except for the pricing.
In all honesty, I find hardly believable that going from 3030 to 4040 footprint can provide much of a performance gain for emitters so small die size wise. And mind you, there are 0 actual tests of the 4040 emitters; just a lot of gossip. A good emitter bin can make a much bigger difference in practice.
In any case let me tell you these are being sold fairly expensive right now, in my opinion of course. And you know why.
Not my cup of tea, in all honesty.
—
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Gossip? Hank has #'s for his K1. I received yesterday 2 K1 drivers and 1 Boost HL on a 32 mm 4040 MCPCB. Not sure yet where it's gonna go though - think'n of a BOSS1 (100 mm head diam reflector light). I'm not setup or have the time for testing the LED though.
Gossip? Hank has #‘s for his K1. I received yesterday 2 K1 drivers and 1 Boost HL on a 32 mm 4040 MCPCB. Not sure yet where it’s gonna go though – think’n of a BOSS1 (100 mm head diam reflector light). I’m not setup or have the time for testing the LED though.
I couldn’t achieve over 1318 lumens (30s) driven to 8A, 7A was 5 lumens lower. Barely any gain over the W2
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Texas Ace Lumen Tube calibrated with maukka lights
Not sure why you think I might have that wrong. The one I received is a small square LED surface on a 4040 MCPCB, so really can only be the Boost HL, which apparently beats the Boost HX in throw in the K1. Not to say the amps are properly maximized, but I don't think Hank will make claims of kcd without measuring it.
Gossip? Hank has #'s for his K1. I received yesterday 2 K1 drivers and 1 Boost HL on a 32 mm 4040 MCPCB. Not sure yet where it's gonna go though - think'n of a BOSS1 (100 mm head diam reflector light). I'm not setup or have the time for testing the LED though.
I couldn't achieve over 1318 lumens (30s) driven to 8A, 7A was 5 lumens lower. Barely any gain over the W2
You are talking about a Boost HX, not Boost HL, is that right? I have a Boost HL - it beats the Boost HX in the stock K1 (650 kcd for the HL, 600 kcd for the HX).
Boost HL is the smaller square dye, while the HX is the bigger rectangular dye.
I see - looks like Simon only sells the Boost HX, not the Boost HL. With Hank in the K1 you have a choice of either (and if you ask patiently, he may sell you a mounted LED, whichever one you request ).
Gossip? Hank has #‘s for his K1. I received yesterday 2 K1 drivers and 1 Boost HL on a 32 mm 4040 MCPCB. Not sure yet where it’s gonna go though – think’n of a BOSS1 (100 mm head diam reflector light). I’m not setup or have the time for testing the LED though.
I couldn’t achieve over 1318 lumens (30s) driven to 8A, 7A was 5 lumens lower. Barely any gain over the W2
You are talking about a Boost HX, not Boost HL, is that right? I have a Boost HL – it beats the Boost HX in the stock K1 (650 kcd for the HL, 600 kcd for the HX).
Boost HL is the smaller square dye, while the HX is the bigger rectangular dye.
I see – looks like Simon only sells the Boost HX, not the Boost HL. With Hank in the K1 you have a choice of either (and if you ask patiently, he may sell you a mounted LED, whichever one you request ).
Yes, the HX. I really get lost with the Osram model names.
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Texas Ace Lumen Tube calibrated with maukka lights
SkyLumen was the first to use the WF1/2/1.1/2.1 name format AFAIK, and honestly it makes a lot of sense IMO. I have to look up the actually model numbers half the time I see people discussing them to remember which is being referenced.
I was asking because I didn’t know anyone still had HLs for sale. I’ve been looking for one for since LED4P went oos and Osram obsoleted the model. I’ll get one before they’re gone..
Also, if Hank is calling them W2.1, that would be opposite naming convention from what I am familiar with. Typically (Vin/Skylumen), the ‘.1’ extension indicates the newer/upgraded 4040 package, while the W(n) still denotes the emitting surface area. So the HL would be a W1.1 in Vin shorthand, and HX= W2.1
Seems like Hanks naming convention is different, which will add to the confusion with these letter soup Osrams.
Also, if Hank is calling them W2.1, that would be opposite naming convention from what I am familiar with. Typically (Vin/Skylumen), the '.1' extension indicates the newer/upgraded 4040 package, while the W(n) still denotes the emitting surface area. So the HL would be a W1.1 in Vin shorthand, and HX= W2.1 Seems like Hanks naming convention is different, which will add to the confusion with these letter soup Osrams.
Of course he doesn't say what these LED's are, that I can find.
On BLF, Hank and his lights are far more popular than Vinh (sheer volume) so I'd stick with Hank's, unless Hank can be convinced to change his naming convention.
Speaking of regulation, it's either regulated or not. So, if the driver is regulated that's what it will do. Linear or buck drivers cannot boost voltage, only reduce it. In the case of linear drivers like the one you linked above (found it here too) or Simon's newer drivers (all of them are dubbed or advertised for SST40, by the way), any excess voltage and current is burned by the driver in its MOSFETs; the driver senses outgoing current in its sense resistor, this happens because when current goes through the resistor it causes a voltage drop in the sense resistor terminals which is amplified by a current sense amplifier (it amplifies the sense voltage at the resistor terminals) and fed into the MCU. The MCU uses this information to precisely adjust the MOSFETs' VGS; this controls the resistance of the MOSFETs to the flow of current, i.e. uses the MOSFETs in linear mode, and this way it can precisely control how much current is flowing (think of electricity like a gas, and imagine the MOSFETs are like a gas valve, and the MCU is someone who opens the valve just enough for the required amount of gas to flow). When less than the maximum allowable current is sensed, the MOSFETs are of course driven “all the way” or in saturation mode (in this case the amount of gas pressure is not enough and the MCU just fully opens the gas valve).
The newest single cell 8A buck driver from Convoy is a very smart choice, because it is a switching driver. This means it does not burn excess voltage (times current which is power) as heat in the board, instead it uses a buck converter to efficiently and precisely adjust the voltage to the led for the required amount of current to flow (sensed with a sense resistor, of course). The reason for such a powerful buck converter in limited space is that it is meant for single cell operation, and thus it is not necessary to employ a much bigger inductor which would be required for it to work with 2S cells input.
If you can swap sense resistors in drivers, adjusting the sense resistor value has a direct effect on the amount of current the driver handles. As an example, Simon's Ø22mm 6A drivers (this or that). They are meant for 6A maximum driving current and employ a 10mΩ sense resistor (R010); this means V = I × R = 6A × 10mΩ = 60mV of sense voltage (in case you are wondering, the current to the emitter entirely goes via the sense resistor). Knowing the sense voltage we can re-calculate the sense resistor value for a different current. Since you'd like to increase current, you could stack another sense resistor atop the one in the driver (more conductance) to raise the current. How much? Well, for +1A let's do the math: R = V / I = 60mV / 1A = 60mΩ; this one was
easy. On top of this, I just found an advertisement which precisely sells 2010 imperial 62mΩ sense resistors here, which is super close. Proper driver cooling is recommended if raising its limits, namely if you do away with temperature regulation (removing the onboard NTC). I can understand, though, that modifying a driver requires certain tools and skill.
Back on CULPM1.TG issues, I find somewhat surprising these underperforming CULPM1.TG units. Must be some bad bin. Got them from Shenzhen silver ingot Technology Co., Ltd. in AliExpress?
By the way, the CSLPM1.TG is about less than half the price of the CULPM1.TG, what gives?
I have a thrower with a CSLPM1.TG driven at 6.5A or so, I built it for someone else but needs a repair. Nice to see that I chose a proper driving current for it.
Deleting a just published post causes the forum thread answer notification to fail. Thus, if you need to change your just published post, edit it. Thanks.
Please avoid fully quoting lenghty posts, namely with nested quotes. Trim quotes down to the essential. Helps with neatness and legibility. Thanks.
I recommend saying no to Covid vaccine. Listen to your soul.
I’m confused too at some point with those tests from Funtastic.
As Barkuti mentioned, surprised to see that the CULPM1 performed worse than the CSLPM1 when the CULPM1 is higher Spec. As in djozz test for CSLPM1 peak at 7.5amp while Funtastic CULPM1 peak at 7amp…????
I only tested 6A, 7A, 8A, and 7A saw the best performance. 8A had only 5 lumens more.
djozz did tell me his test was also 7A and that he wasn’t impressed at all.
Texas Ace Lumen Tube calibrated with maukka lights
New Zealand store – https://www.piercingthedarkness.co.nz (NZ customers only)
YouTube channel – https://www.youtube.com/channel/UCIUWi2vYp4CWrRkOJM70t_w/videos (Demos for my customers, and reviews)
Yes Funtastic… saw all you posts and tests.. Good reference. Thanks…
Thanks for that write up Barkuti, I need to read it a couple more times to understand all of it. I wasn’t familiar with Ohm’s Law so I was scratching my head wondering what the letter “I” meant until I input that formula into google haha.
The CULPM1 leds are from Convoy. I have been using the 7A ramping driver as I’m unsure how good it is to drive them with that 8A driver. There’s no tint shift at 8A so that’s a good sign anyway.
Texas Ace Lumen Tube calibrated with maukka lights
New Zealand store – https://www.piercingthedarkness.co.nz (NZ customers only)
YouTube channel – https://www.youtube.com/channel/UCIUWi2vYp4CWrRkOJM70t_w/videos (Demos for my customers, and reviews)
9A max but that’s not what I’m getting on the ones I received from Convoy
Texas Ace Lumen Tube calibrated with maukka lights
New Zealand store – https://www.piercingthedarkness.co.nz (NZ customers only)
YouTube channel – https://www.youtube.com/channel/UCIUWi2vYp4CWrRkOJM70t_w/videos (Demos for my customers, and reviews)
I’m starting to feel that Convoy has a badly reflowed batch of CULPM1 chips or these just have a lot difference between each.
4 chips
led 1 – 7A – 1135
led 2 – 7A – 1300
led 3 – 7A – 1250
led 4 – 6.4A – 1320, 7A – 1280
very strange.
Texas Ace Lumen Tube calibrated with maukka lights
New Zealand store – https://www.piercingthedarkness.co.nz (NZ customers only)
YouTube channel – https://www.youtube.com/channel/UCIUWi2vYp4CWrRkOJM70t_w/videos (Demos for my customers, and reviews)
Have you described your testing process in detail? If you are trying to get down to that level of precision you should work those details out too.
I’m just using Convoy’s ramping driver
Top three were in the L21A, bottom one in the C8+ , the only difference in the setup is the L21A tail switch. It’s a fet driver so I do understand it’s not going to be the same across all leds but should it be that much? I’ve never had it vary so much on other models using the same springs and batteries
Texas Ace Lumen Tube calibrated with maukka lights
New Zealand store – https://www.piercingthedarkness.co.nz (NZ customers only)
YouTube channel – https://www.youtube.com/channel/UCIUWi2vYp4CWrRkOJM70t_w/videos (Demos for my customers, and reviews)
In that case I think there are a bit too many variables to get more than a rough average which I think you succeeded in. Certainly not enough precision to worry about reflow though.
Unless you use a power supply and heavy duty heatsink combined with more consistent measure like bare LED using lux not lumens. This is why djozz and others get so burnt out doing it. That level of detail necessary is a pain in the butt.
Sorry?
What is a FET driver?
As far as I understand, what is considered a (MOS)FET driver is a sort of very simple driver basically consisting of a switch and an MCU. These drivers are unregulated and the only way to obtain modes with them is to use the dreaded PWM (pulse width modulation). To attain regulation the flow of current must be sensed, this is done in a current sense resistor, usually a big sized, ultra-low value resistor in the periphery of the driver board:
A 1206 imperial R005 in this one.
So, technically speaking this is not a “FET” driver. These drivers are regulated, they make use of the voltage they sense via their sense resistor to trigger events in their MCU, that is, they use such information to drive the MOSFET gate so the required amount of current goes through the sense resistor (i.e. they open the switch “just enough”).
Deleting a just published post causes the forum thread answer notification to fail. Thus, if you need to change your just published post, edit it. Thanks.
Please avoid fully quoting lenghty posts, namely with nested quotes. Trim quotes down to the essential. Helps with neatness and legibility. Thanks.
I recommend saying no to Covid vaccine. Listen to your soul.
Ah, okay. I appreciate the correction. I struggle quite a bit to understand how components work when it’s something new in writing, I learn best visually.
Now I realize that the driver I’m after is one that has stabilization, would that be constant current or something else? What we see usually on boost drivers.
Texas Ace Lumen Tube calibrated with maukka lights
New Zealand store – https://www.piercingthedarkness.co.nz (NZ customers only)
YouTube channel – https://www.youtube.com/channel/UCIUWi2vYp4CWrRkOJM70t_w/videos (Demos for my customers, and reviews)
I loved these kind of conversation – it easily grab good information…I actually read up all Barkuti comment and had full understanding…Make sense!
In search of the most ideal flashlight in town:
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I understand everything apart from the maths haha.
I had a stabilized output in my thinking which is different so now I understand regulation more now
Texas Ace Lumen Tube calibrated with maukka lights
New Zealand store – https://www.piercingthedarkness.co.nz (NZ customers only)
YouTube channel – https://www.youtube.com/channel/UCIUWi2vYp4CWrRkOJM70t_w/videos (Demos for my customers, and reviews)
My latest chart on the OSRAM's. If anyone can verify, change, or fill in blanks, please do so.
OSRAM LED’s for max throw
Color - Part # - footprint (LED surface) nickname Max/Pulsed Peak Output (A)
White – KW CSLNM1.TG – 3030 (1mm²) W1 3/3.3A 4.5-5.0 A (W1/NM1)
White – KW CSLPM1.TG – 3030 (2mm²) W2 5/6A 7.0-8.0 A (W2/PM1)
White – KW CULNM1.TG – 4040 (1mm²) W2.1 3.3/4A ~6A (Boost HL)
White – KW CULPM1.TG – 4040 (2mm²) W2.2 6.6/8A 9 A (Boost HX)
Red – KR CSLNM1.23 – 3030 (1mm²) W1
Blue – KB CSLNM1.14 – 3030 (1mm²) W1
Green – KP CSLNM1.F1 – 3030 (1mm²) W1 3/4A 6.5 – 7.0 A
Green – KP CSLPM1.F1 – 3030 (2mm²) W1
Yellow – KY CSLNM1.FY - 3030 (1mm²) W1
More OSRAM Website links
3030 variants
4040 (boost) variants
Clear and simple. Thanks Tom!
[WTS] HID host: http://budgetlightforum.com/node/68693
[WTB] Interesting LEDs:http://budgetlightforum.com/node/68968
Tom E, you may want to fix the nicknames back there: if the NM1 and PM1 are Wn, where n = die area in mm², then the Boost HL and HX which are their bigger footprint counterparts should be dubbed Wn.something, W1+ for the KW CULNM1.TG and W2+ for the KW CULPM1.TG, for example. You could also add some proper, simple surnames to the color variants for the sake of simplicity (just remember that the pure green is the phosphor converted green, with some CRI, despite being listed with a narrow frequency window versus the true green).
Just a suggestion.
Deleting a just published post causes the forum thread answer notification to fail. Thus, if you need to change your just published post, edit it. Thanks.
Please avoid fully quoting lenghty posts, namely with nested quotes. Trim quotes down to the essential. Helps with neatness and legibility. Thanks.
I recommend saying no to Covid vaccine. Listen to your soul.
It’s a small indutance value of 0.47uH, the smaller the inductance the smaller the DCR usually, which is another reason you want a small inductance value in such small place, to actually minimize DCR at high currents.
Still it is small inductor, low profile, I cannot imagine constant current at 8A, for lower currents like 3A surely no problems. I would like to see a review with a flashlight, without artificial active cooling.
Otherwise it seems to look good for example appears like a couple of external FETs rather than integrated into the switching IC.
Sorry, going with Hank's K1 conventions for nick naming these things - https://intl-outdoor.com/k1-21700-thrower-led-flashlight.html.
Don't think it's the best, but thought Hank was following other conventions.
I'm keeping this is a Word docx file for now. Will make it public when it's more finalized. I've learned a few things since putting this together. The different flavors always had me confused somewhat. For white, looks like the Boost HL and Boost HX are making the old W1 and W2's obsolete, except for the pricing.
Hank's convention seems to be Wm.n, where m is footprint (1 = 3030, 2 = 4040) and n is die size in mm².
Honestly, I still
prefer the manufacturer's name; can't go wrong with it.
The 3030 emitters obsolete? I don't think so. As far as I am aware there basically is only one test done of the white flat 1mm² (Reflow conditions tested of Osram KW CSLNM1-KW (White Flat 1mm2)), and even less about the 2mm² (here), both in 3030 footprint.
In all honesty, I find hardly believable that going from 3030 to 4040 footprint can provide much of a performance gain for emitters so small die size wise. And mind you, there are 0 actual tests of the 4040 emitters; just a lot of gossip. A good emitter bin can make a much bigger difference in practice.
In any case let me tell you these are being sold fairly expensive right now, in my opinion of course. And you know why.
Not my cup of tea, in all honesty.
Deleting a just published post causes the forum thread answer notification to fail. Thus, if you need to change your just published post, edit it. Thanks.
Please avoid fully quoting lenghty posts, namely with nested quotes. Trim quotes down to the essential. Helps with neatness and legibility. Thanks.
I recommend saying no to Covid vaccine. Listen to your soul.
Gossip? Hank has #'s for his K1. I received yesterday 2 K1 drivers and 1 Boost HL on a 32 mm 4040 MCPCB. Not sure yet where it's gonna go though - think'n of a BOSS1 (100 mm head diam reflector light). I'm not setup or have the time for testing the LED though.
I couldn’t achieve over 1318 lumens (30s) driven to 8A, 7A was 5 lumens lower. Barely any gain over the W2
Texas Ace Lumen Tube calibrated with maukka lights
New Zealand store – https://www.piercingthedarkness.co.nz (NZ customers only)
YouTube channel – https://www.youtube.com/channel/UCIUWi2vYp4CWrRkOJM70t_w/videos (Demos for my customers, and reviews)
Do you mean Boost HX? the 2mm^2 version?
The Boost HL is the KW CULNM1.TG, what Hank calls the W2.1, he rates at 650 kcd in the K1.
The Boost HX is the KW CULPM1.TG, what Hank calls the W2.2, he rates at 600 kcd in the K1.
Not sure why you think I might have that wrong. The one I received is a small square LED surface on a 4040 MCPCB, so really can only be the Boost HL, which apparently beats the Boost HX in throw in the K1. Not to say the amps are properly maximized, but I don't think Hank will make claims of kcd without measuring it.
You are talking about a Boost HX, not Boost HL, is that right? I have a Boost HL - it beats the Boost HX in the stock K1 (650 kcd for the HL, 600 kcd for the HX).
Boost HL is the smaller square dye, while the HX is the bigger rectangular dye.
I see - looks like Simon only sells the Boost HX, not the Boost HL. With Hank in the K1 you have a choice of either (and if you ask patiently, he may sell you a mounted LED, whichever one you request
).
Yes, the HX. I really get lost with the Osram model names.
Texas Ace Lumen Tube calibrated with maukka lights
New Zealand store – https://www.piercingthedarkness.co.nz (NZ customers only)
YouTube channel – https://www.youtube.com/channel/UCIUWi2vYp4CWrRkOJM70t_w/videos (Demos for my customers, and reviews)
SkyLumen was the first to use the WF1/2/1.1/2.1 name format AFAIK, and honestly it makes a lot of sense IMO. I have to look up the actually model numbers half the time I see people discussing them to remember which is being referenced.
I was asking because I didn’t know anyone still had HLs for sale. I’ve been looking for one for since LED4P went oos and Osram obsoleted the model. I’ll get one before they’re gone..
Also, if Hank is calling them W2.1, that would be opposite naming convention from what I am familiar with. Typically (Vin/Skylumen), the ‘.1’ extension indicates the newer/upgraded 4040 package, while the W(n) still denotes the emitting surface area. So the HL would be a W1.1 in Vin shorthand, and HX= W2.1
Seems like Hanks naming convention is different, which will add to the confusion with these letter soup Osrams.
There's no "if Hank", Hank is. I've included the link to where he does it couple times - here it is again: https://intl-outdoor.com/led-flashlights/k1-21700-thrower-led-flashlight.html
Been look'n at the Skylumen site and found a W1.1 ref: https://skylumen.com/collections/v54-lights/products/one-off-olights, where he identifies the W1.1 as the max throw version
And here's a W2.1 ref: https://skylumen.com/collections/v54-lights/products/one-off-l17vn-the-tactical-mc13vn
Of course he doesn't say what these LED's are, that I can find.
On BLF, Hank and his lights are far more popular than Vinh (sheer volume) so I'd stick with Hank's, unless Hank can be convinced to change his naming convention.
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