I purchased a R047 from here
Now I noticed that TA said 3W power the link is for 1W power, would that still work? or do I risk effing something up?
I purchased a R047 from here
Now I noticed that TA said 3W power the link is for 1W power, would that still work? or do I risk effing something up?
That resistor while technically ok is only rated for 1W. The resistor needs to be rated for 3W for long term reliability.
I have yet to find a reasonably priced 3w .047ohm resistor myself, so I just recommend the .050 and .040 now.
AlexGT: LEDtec:I would like to mod my GT with an XHP70.2, someone can kindly tell me which resistor to replace on the original driver, and possibly which value to use?
Thanks.I purchased a R047 from here:
10Pcs 2512 SMD Alloy Resistor R010 -R091 0.01R ~0.091R 0.05R 0.33R R020 1W 1% | eBay
That resistor while technically ok is only rated for 1W. The resistor needs to be rated for 3W for long term reliability.
I have yet to find a reasonably priced 3w .047ohm resistor myself, so I just recommend the .050 and .040 now.
Thanks for the clarification TA, I just noticed it! The cheapest I found was $20 for 100 pieces… Will this one work?
Yes, that would work but please don’t spend that much on a resistor. Better to just get an 050 or 040 for less then $1.
Or for that kind of money wait until my TA drivers are finished and buy one of those. It will give you a lot more performance from the xhp70.2.
thanks, I still did not understand what is the resistor to change, over the weekend I will try again.
these seem right and at a good price
https://m.ebay.it/itm/10x-LRP2512-R040-1-Resistor-sensing-SMD-2512-40m-3W-1-55-170-C-VIKING-/192399386351?\_mwBanner=1
or am I wrong ?
thanks, I still did not understand what is the resistor to change, over the weekend I will try again.
these seem right and at a good price
10x LRP2512-R040-1 Resistor sensing SMD 2512 40mΩ 3W ±1 -55÷170°C VIKING | Acquisti Online su eBay
Yes, that one will work fine.
Once you look at the driver it will be clear which one it is. It is the only resistor of that size on the driver. Right now it should say 91 or something on it.
Yes, that would work but please don’t spend that much on a resistor. Better to just get an 050 or 040 for less then $1.
Or for that kind of money wait until my TA drivers are finished and buy one of those. It will give you a lot more performance from the xhp70.2.
I sure won’t buy @ $20, will keep looking around or just wait for your driver boards, I’m not in a hurry…
Thanks TA, I’ll wait for your drivers.
Lexel wrote: “I am working on a CFT-90 driver for GT”.
Hmmmmmm……I think I already know where part of my holiday allowance will go to
Djozz and I did some measurements this evening, at 21, 13 and 8 meters.
Djozz’ light performs quite a lot less less then mine, so we measured only my light at all three distances.
And Djozz has his work cut out to find out what’s wrong with his light. :rage:
Results:
Djozz light: 21 mtr = 832.167Cd
My light at 21 mtr = 1.142.190Cd
Mine at 13 mtr = 1.139.060Cd
Mine at 8 mtr = 1.142.336Cd
(We measured with Djozz’ calibrated Gossen Luxmeter and deducted the ambient light @ 61Cd).
At first I was baffled by the lower readings at higher distances and thought it might have to do with the convergance of the light but I saw others posting
similar results, so……it looks like the BLF GT is already fully focussed at 8 meters.
1.142.336Cd is not bad, not bad at all, but still a little bit lower then I had hoped for.
So, thinking of replacing the led with the latest bin and maybe giving it a little more power as well, say 2,8A instead of 2,5A.
Then again, a custom Lexel driver and a CFT-90 might be really nice as well
Cheers and wishing you all very bright days and nights,
Nico
Texas_Ace: AlexGT: LEDtec:I would like to mod my GT with an XHP70.2, someone can kindly tell me which resistor to replace on the original driver, and possibly which value to use?
Thanks.I purchased a R047 from here:
10Pcs 2512 SMD Alloy Resistor R010 -R091 0.01R ~0.091R 0.05R 0.33R R020 1W 1% | eBay
That resistor while technically ok is only rated for 1W. The resistor needs to be rated for 3W for long term reliability.
I have yet to find a reasonably priced 3w .047ohm resistor myself, so I just recommend the .050 and .040 now.
Thanks for the clarification TA, I just noticed it! The cheapest I found was $20 for 100 pieces… Will this one work?
Driving a XHP70 with just a 0.047 Ohm resistor will be disappointing at 6V
This would result in 5A
Also switching frequency would not be ideal, the diode would be quite close to its limit
I changed the Inductor, MOSFET, capacitors and diode with better parts for higher currents also the switching frequency will be set to a point where the drivers efficiency gets optimal
Also reducing the current sense resistor and lowering the current control voltage divider helps reducing heat
I should get next week the 20-40A synchronous Buck driver boards that I developed for CFT-90 and going to assemble and test the first prototype
Did someone find transparent 12/14mm switch covers?
I find only green and orange in the chineese flashlight shops
The only ones I know
13.6x6.3mm https://goo.gl/V3LJqr (it goes against my principles, but the link does not work without shortening it, sorry)
14x8mm http://kaidomain.com/p/S024710.Silicone-Tailcaps-14mm-x-8mm-Transparent
.
pommie:With an xp-g* why not just use one cell per holder and use a bit of wire as a jumper, that way you can easily revert back to standard, same with two cells for 6v leds, and use three cells for those hard driven 6v leds :smiling_imp: Cheers David
Ah dummy pass through carrier fillers, smart!
Or buy the solarforce dummy batteries.
I have opened my flashlight by 2 people (my son and I) using non-skid rubber gloves.
With the stock Led obtained 925.000Cd. I have replaced it with a boiling thinner dedomed XHP35 HD and now I achieve 1.186.000Cd.
The Led I used was removed from a Haikelite MT02.
The measurements are at 10 meters. At 15 meters I get 1.118.000Cd
I got a higher reading at 15 meters when compared to a 10 meter throwing distance when I tested my GT.
Lfatman:I have opened my flashlight by 2 people (my son and I) using non-skid rubber gloves.
With the stock Led obtained 925.000Cd. I have replaced it with a boiling thinner dedomed XHP35 HD and now I achieve 1.186.000Cd.
The Led I used was removed from a Haikelite MT02.
The measurements are at 10 meters. At 15 meters I get 1.118.000Cd
I got a higher reading at 15 meters when compared to a 10 meter throwing distance when I tested my GT.
Yes, most get higher readings are 15-20m.
If you do not then that is usually a sign that there is too much particulate in the air, be it humidity, dirt, dust, pollen ect.
AlexGT: Texas_Ace: AlexGT: LEDtec:I would like to mod my GT with an XHP70.2, someone can kindly tell me which resistor to replace on the original driver, and possibly which value to use?
Thanks.I purchased a R047 from here:
10Pcs 2512 SMD Alloy Resistor R010 -R091 0.01R ~0.091R 0.05R 0.33R R020 1W 1% | eBay
That resistor while technically ok is only rated for 1W. The resistor needs to be rated for 3W for long term reliability.
I have yet to find a reasonably priced 3w .047ohm resistor myself, so I just recommend the .050 and .040 now.
Thanks for the clarification TA, I just noticed it! The cheapest I found was $20 for 100 pieces… Will this one work?
Driving a XHP70 with just a 0.047 Ohm resistor will be disappointing at 6V
This would result in 5A
Also switching frequency would not be ideal, the diode would be quite close to its limitI changed the Inductor, MOSFET, capacitors and diode with better parts for higher currents also the switching frequency will be set to a point where the drivers efficiency gets optimal
Also reducing the current sense resistor and lowering the current control voltage divider helps reducing heatI should get next week the 20-40A synchronous Buck driver boards that I developed for CFT-90 and going to assemble and test the first prototype
I was thinking in driving the XHP-70.2 LED at 12v not 6v, but I have decided to wait until a better driver is available…
Speaking of said better driver. I have the parts incoming to test the prototype XHP70.2 TA driver for the GT next week if all goes well.
First in line when you start selling…
Also getting a prototype XHP70.2 mcpcb to test as well. :sunglasses:
Really pressing for them to make these for modders.
Also getting a prototype XHP70.2 mcpcb to test as well. :sunglasses:
Really pressing for them to make these for modders.
Thanks Ta , this is awesome !