I'm very happy to have the opportunity to measure a few things on the Luxeon Q (output and Vf @ 350mA, Tint color coordinates xc,yc and the final OTF output at perhaps 1.75A). I have an Integrating Sphere and a Color Analyzer to my disposal. I will post the results here when done.
Thanks djozz. I stand by my original post. Amazing dissecting on the led. There is not a hope in this world it would work again if I went near it with a scalpel.
Ouch!! :_( Can you get some kevlar gloves? I want a pair now I know they exist, for my knive sharpening. I don’t think even level 5 can protect from cutting machinery though.
The problem with gloves is, they can turn a minor slip into a major one. An incident with bare hands that might just give you a little nick, when wearing gloves, they can get snagged and wrapped around the spinning tooling and then you have much bigger problems.
As promised here is a test of the Luxeon Q that I was lucky to get from Djozz.
I reflowed the LED on a XP-G board from IS with Lodestar solder paste, almost 3 years old, re-juvenated successfully using drops of isopropyl alcohol.
Vf and Output was measured before it was mounted in a P60 pill and output measured again after. Finally it was mounted in a Solarforce L2 copy.
Then the output at high current and the tint in the hotspot was measured.
There was a yellow center spot in the hotspot, but it disappeared when I tried another reflector (for XM-L).
Outside the hotspot there was a broad (weak) yellowish ring and then the purplish spill. I often see that pattern for XM-L but not so often for XP-G.
Results:
At 350mA: Vf = 2.90 V, Output = 140 lm, In the pill with reflector: 121 lm
In the host at 1.42 A: Output = 360 lm, sagging to 330 after half a minute.
Tint with reflector 1: The Tint was measured to xc,yc = 0.326,0.344 with offset 5 CIELuv*) to the greenish side of the black body curve. That places the tint near the middle of Bin 2B. CCT = 5780.
Tint with reflector 2: The Tint was measured to xc,yc = 0.322,0.337 with offset 3 CIELuv*) to the greenish side of the black body curve. That places the tint near the bottom left of Bin 2B. CCT = 5985.
*) CIELuv is used to judge the distance between colors. 1 CIELuv is the smallest difference the eye can see so 5 or 3 is not much but can be seen in comparison between two lights.
Conclusion:
I like that the output from this Luxeon Q is like Cree's R4-R5. It is only specified to 1A but calculations indicate that in a "normal" host, eg. Solarforce L2, the critical junction temperature 150'C would first be reached at a little over 2 Amp. I also like that the tint is fairly close to the black body curve (pure white).
I do not like the (weak) yellowish zone outside the hotspot. Perhaps this is due to yellow light coming out sideways. I think XP-G/2 (but not XM-L) are better at this point.
I mounted the Luxeon Q on a 20mm Noctigon that was mounted on a fan cooled heatsink and then crammed it onto the Sphere 'o Many Mysteries. My Q maxed out at around 3.0 amps/525 lumens/3.54 Vf.
nice dome-slicing method i tried it before, but nto the paperclip method. Im guessing you have givenall the luzeons away by now ? if not i can find a use for them.