Thank you for your research! I like to read about different LEDs; datasheets are boring. :bigsmile: I would like to try one of these Luxeon Q LEDs.
the giveaway, it just ended 
, and there's winners. 10 people showed interest, and I added Comfy because I guessed he would not mind one either 
:
random.coffeefilterholder.org did its magic on these names:
And the winners are:
I think that it would be neat if texaspyro puts one in his sphere as well, so I will send a sixth one to him as well . Winners, please PM me an address, I will send the leds on monday or tuesday.
[quote=djozz]
removing the phosfor at the sides of the die will produce a narrower beam, but the illuminance of the die (and thus throw) I expect not to increase. If you remove the surrounding phosfor straight up to the die there will be blue light leaking from the sides (should be cool looking in a reflector light 
)
[/qoute]
A hobby is there to try it all, and theory is not always what happens in reality, so here I went 
:
The result in stereo (@ Hbomb: the way I make these stereo pairs is just taking cell phone pictures through the left and right eyepiece of my stereo microscope):
I put the trimmed led in my Uniquefire UF-T20, and throw did improve, but just a bit: 73 klux@1 meter now, still way less than a dedomed xpg2 or xpe2. The hotspot was indeed much nicer without the yellow around it:
Last thing was to put the pill into a Convoy C8 host with a (Fasttech) smooth reflector that I have waiting for a friend's project. 
And the pill does not fit, wrong threading! A Fasttech C8 pill does not fit a Fasttech Convoy C8! (you C8-addicts thread boys already knew this of course). But with some fiddling and the bezel not quite screwed down I got it working for the test, I got 66 klux at 1 meter throw, with a OTF output of 376 lumen. (the C8 addicts I believe got around 100klux at 3A from a dedomed xpg2 or xpe2, up to 125klux with a xpg2 at higher amps) :
Nice hotspot though 
:
Well, it was nice messing about again with the led, but still no shock and awe compared to what is already there I'm afraid.
So it's not enough that you torture and kill emitters with current? You have to also slice and dice them? You, are a very very bad man. 
Great work and pictures. Thank you for this excellent exploration into the Luxeon Q. I wonder if the manufacture will take note of your work. I hope so.
Thanks for the give away. PM will be incoming.
Oh, and very cool using a paperclip as a cutting guide. I think I'll be stealing that one... :D
for the giveaway.
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.
Sure there is… just practice on yourself first… J)
Excellent slicing & dicing! 
You had fabulous pictures already & now an animated gif?
The forum doesn’t accept animated avatars, right? 
thanks for the answer djozz. The images work perfectly with my semi-crossed vision 
I have. 
Ugggh, I hate it when that happens… there goes half your love life for a while… J)
Ouch! That happened not long ago 
In fact, I believe it does, Johnnymac had one, and a few others.
MRsDNF, buddy, I think you need leather work gloves. Don’t want to ever cut a tendon. 
That cut was pretty deep, yes?
Djozz: Yea, Johnnymac’s shinning eyes!
Yay I won!! :party: Thank you for the giveaway!
Nice LED surgery too! :bigsmile:
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.
Just thinking about it snagging is making me shudder.
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.