LED obtained from Led4Power on a 20mm copper MCPCB.
LED heatsinked on a Coolermaster GeminII S CPU cooler with a 120mm corsair SP fan at full speed.
Thermal Grizzly Conductonaut liquid metal used between the MCPCB and heatsink.
MCPCB tightened down with two screws.
Luxmeter is an LX1330B.
Distance from LED to luxmeter measured with a UT393B laser meter at 1m +/- 0.01
Stray light from LED blocked using Edmund Optics flock paper to avoid reflections.
Current was monitored with a UT210E clamp meter.
Power supply used is a DPS5020, also used for the voltage readings.
Die area used for calculations is from datasheet, 1.03mm x 1.03mm
Results:
Very impressive LED under extreme cooling.
Peak reached at ~5.6A, would not recommend going this high in a flashlight host.
Should be close to 700cd/mm^2 with an RLT collar, if I feel like it I might redo the test with a collar on it.
Yeah it won’t die, you can see from djozz’s test that it can handle a lot of current (probably thanks to no bond wires)
It just heats up too much and output starts dropping.
Yeah in a normal flashlight the peak will be at around 4A, more like djozz’s test.
Even at 3A you get msot of the performance.
This would be a great LED to swap into all those flashlights that have a 3A driver usually driving an XP-L HI at 1000lm.
I really wanted to know how far I could push it Should I try make a 7Mcd optofire?
What is the focal point relative to the Cree led? Do I need a shorter or taller spacer? I am having trouble focusing these and creating as tight of a spot as the xpe2 they replaced.
Output looks about the same intensity as before, but I still don’t have a light meter to verify. I am also not driving these hard enough as I am putting about 2.5A . Tint on the other hand is way better than a dedomed xpe2.
Did another test, this time with a small RLT collar.
The LED reached its peak sooner, at about 5.3A instead of 5.6, likely due to the additional heating of the die.
About a 2x improvement from the small collar.
So driving the CSLNM1.TG at 4A nets ≈90% of maximum performance, and is probably close to the maximum attainable in a flashlight due to thermal reasons.
Indeed interesting. Has this led emitter been tint and CRI tested? :-D
Well it won’t drop in first 20-30 seconds or so… Now some will say 20 seconds! That is to low… Real test is above 30 seconds…
For me even first 5 seconds are more than enough to do job I need to do… This kind of action: Scan in front of me - nothing in range - cool down… When it lasts to 30 seconds it is super long scan
Yeah I should also mention I do all my tests continuously, without letting the LED cool down at any time, I just keep increasing the current until there is no improvement.
None of that “X performance at turn-on” stuff.
For the record, I just did a test with the large RLT collar and got 708 (small collar max was 689) so 667cd/mm^2.
There is almost no improvement from the large collar over the small, it’s still ~2x intensity increase.
Can’t wait for the boost HX to come out so I can buy and test it.
I would buy the CSLPM1 but shipping makes it expensive and it will just be obsolete for us when the boost HX becomes available anyway.
Thanks a lot for these two tests Enderman, especially the one with the small collar!!! The latter is very relevant to me as I plan on having a small light with this configuration at some point in the future.
I have all the needed parts except for the body of the light. It will be a compact light that showcases what is possible with LEDs. It will also look cool because there will be a clear cylinder around the collar instead of metal.
No, it doesn’t need to be focusable. Something simple where the head has the right diameter and can be removed without removing the LED. Probably a 1x 18650 host.