OSRAM CSLNM1.TG & CULNM1.TG 1mm², CSLPM1.TG & CULPM1.TG 2mm²

Yes something like that but with H,M,L no memory and no thermal regulation. Who wants thermal regulation anyway? That ain’t for serious modders :laughing:

Well, the CULPM1.TG perform worse than the CSLPM1.TG

CSLPM1.TG 6.3A - 1200 lumens at 30 sec

CULPM1.TG (from Convoy)

5.7A 1160 lumens-
7A 1135-
8A 1135-

same reading for both 7 & 8

It’s still barely an improvement

EDIT: Turns out I damaged the led at the beginning when I shorted a wire on the reflector turning purple.

New led at 7A gets 1300 lumens. Increasing to 8A only gets 13 lumen gain. I’ll be driving these with a 50E in Convoy’s ramping driver for 7A

what host and reflector size did you test this on ?

Convoy L21A

Turns out I damaged the led at the beginning when I shorted a wire on the reflector turning purple.

New led at 7A gets 1300 lumens. Increasing to 8A only gets 13 lumen gain. I’ll be driving these with a 50E in Convoy’s ramping driver for 7A

6A achieved just above 1200.

I just realized the CSLPM1.TG & CULPM1.TG are different in size, the led, not the surround part, not sure what that’s called?

The w2.1 is smaller or is it just my eyes fooling me?

Must be an optical illusion. The distance of the emitters to the camera lens in that photograph is also unequal, which also affects assessment.

Counted pixels there and both come out to 1.59mm wide(the vertical dimension in this pic) based on 3.00mm vs 4.00mm package size. Illusion indeed

Awesome, thank you for confirming. I can finally stop staring at them now :person_facepalming:

Can anyone confirm this is constant current? I want a driver with regulation for the W2.1

7A is the lumen limit for this led

The link in your post is broken, Funtastic, missing “l” at the end. I fixed it in my above quote of yours.

That driver features a sense resistor onboard, these are used for regulation. I'd expect it to be constant current.

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 :-D 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.

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.

9A max but that’s not what I’m getting on the ones I received from Convoy

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.

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.