I also had opportunity to play with this larger 2mm white flat maybe even sooner than Led4Power. So this is mine pre- test with classic light meter and clamp meter (so test is just for reference before someone with better equipment test it). Full Samsung INR 30 Q. Single cell 18650 light with FET Djozz driver.
I once used ≈8.1+A (measured effective) for the CSLPM1.TG (2mm²) in a Sofirn C8S, and it worked fine. Driver used: ∅17/22mm weird ramping SST-40 driver with additional R050 on top of the stock R005.
A max at 10A is not what I found in my test (graph also in the first post), but rather at 7.5A. So you are driving the led at its maximum output, provided that the heat path in your build is good, or else you are already over the top. My advice, for flashlights to be sold, is to aim for 6A instead, you are at over 90% of max there and the led is stressed a bit less.
Thanks for the measurements Barkuti! Didn’t know there was a full 2+ mm difference between the two… I think I still prefer the M2 for it’s thin bezels and size/throw efficiency.
I would love to see an 18650 version of the GT Micro… same bezel diameter as the M1 with 10% more reflector area.
Actual measurements are in link above. Also emitter hole is 7mm but the non reflecting area for the purpose of this calculation has more like 10mm diameter. So with those numbers M1 has 494mm^2 and M2 has 461mm^2.
At a white wall up until 4.5A it’s a nice neutral white. If mine is exactly the same led then it must be normal. I got 6pcs on dtp mcpcb. Used Arctic MX-4 thermal paste so it’s not heat.
It would probably be a good idea to send djozz a 2mm² CSLPM1.TG on copper star from Kaidomain, so we could better know the difference versus that earlier test (djozz got better results on a second test of the 1mm² white flat). Many people is getting white flats from Kaidomain, it would be of service. Or maybe send one to Texas_Ace for the same reason.
In particular I have a CSLPM1.TG waiting to be mounted on a K6 host (still heading home in the slow boat). Gonna drive it at a little bit above 7A maximum with a ∅22mm weird ramping SST-40 driver. The good thing is that with such driver I can ramp it down a little and measure the ceilingbounce lux to see how it compares. Considering the kind of beefy host, it should work right.
If it already gets blue at 4.5A, it could be thermal problems too, like a reflow gone bad. I can imagine KD selling lower bins than i.e. led4power, but that should not result in a different current handling, just a bit lower output.
Postage from led4power was affordable sometime ago, just not now. Adding a 2mm² CSLPM1.TG on ∅20mm star makes me see an €12.50 (Premium Packet EU2) shipping fee, when in the past their lowest regular mail shipping fee was €2. On top of this add an extra €0.80 if your order is under €9. Thus, if I want to order a single 2mm² white flat on ∅20mm star I have to pay a whopping €20.90 to see it reach my mailbox. :facepalm: