XP-E2ās will only make their magic at maximum drive current. Anything less than maxed out and you are looking at a surface brightness than another LED could rival (if it was maxed out). You will not be able to use an OSHPark board for this, the thermal resistance will be much too high. (Surface brightness will fall due to heat). I think the only way to do it is with copper strips with some soldered to an underlying sheet of copper and others insulated from it. The XP-series LEDs are quite small, making something like that would be difficult or impossible for me. I guess if you very carefully delaminated an OSHPark PCB and cut out the thermal pads - this also sounds like it would be difficult / impossible for me to do properly on that scale.
Iād think youād use a 3s3p arrangement in order to get the tightest spacing. Thatās 6A at 10V or something (I donāt know the Vf) - a pretty mean demand for a host that holds 3x18650.
The heatsinking on the pill isnāt the best. Youāll probably need to fabricate a new thicker LED shelf as well that would wick the heat away. However, once you have enough mass hitting the inner side walls of the thing, it should be able to handle the heat.
We (including myself) have been talking about reflectors, but I wonder if maybe some TIRs would work? In particular, for 9 emitters, maybe 3 Carclo narrow triples, arranged triangularly?
I got the big head Courui a week ago, very nicely built light with an excellent anodized surface. Feels very polished and professional in hand. The lens is large, much larger than an HD2010 but smaller than a TK61. Iāll double check measurements on it directly.
The reflector has a large flat base to it, might be ideal for what youāre planning. Not ideal for a mod involving a single XM class emitter. In stock form with a hot de-dome mine is doing 190Kcd. Very tight beam profile, surprisingly so.
Itās a nice light, cheap enough, big head, big reflector, multiple cells in parallel for runtime, go for it!
It would be cool if you could have the center and outer emitters separately controlled. That way you could have true throw and floody throw. That is what my scratch build will have, but the emitters will be in a single row.
Dale, the head is over 65mm inside dia to a depth of 35mm, more than enough for a multi led reflector/tir
I know, pics or it is not so Edit, the pics are not showing for some so added the links.
Diameter, what else do I use to show its over 65mm.
www.members.optusnet.com.au/pommietoo/courui-head-dia.jpg
Depth.
www.members.optusnet.com.au/pommietoo/courui-head-depth.jpg
And a bit of off topic led porn just cos I can.
www.members.optusnet.com.au/pommietoo/courui-LED.jpg
Must remember to clean that bit of thermal paste off.
Might also point out that the emitter shelf screws in, the head is bored through. So itād be pretty easy to change the height of the emitter shelf, material, depth, whatever is needed for the case at hand.
68.2 inside the bezel, the shelf for the emitters that threads into the āpillā area where the driver mounts is 41.3mm. And yes, the head is 68.2mm down to around 35mm deep, then tapers to meet the top of the āpillā.
David, your pictures arenāt showing up over here.
In the first image, theres a Samsung 18650 laying nicely on the shelf to demonstrate it is over 65 mm wide down on the shelf. Although I can see its not the emitter shelf, simply the bit the pill/shelf screws into, it is the head itself.
Right, but Pommie is pointing out that it would be relatively easy to make it work. A new copper shelf, wider on top with a reduction then the threads would be ideal and this would allow height adjustment as well. The reflector could be shaved to fit or optics could be utilized to further raise the shelf surface and give more copper.
I wasnt commenting on whether it will work or not. With enough persistence, almost anything is possible. I was just relaying the image and the fact you were measuring the pill area (shinny silver bit), he was measuring the head (annodised bit).
I agree. I have played with three leds soldered together, tight together and even five, but the problem is that as the beam gets out farther, black spots appear, in between the leds. De-domed would actually make that worse. The larger the total die surface, the larger the spot will be. No matter what reflector you use, you can never make an XM-L spot as small as an XR-E spot and you canāt make it as intense. The beam is going to enlarge the further away you get and as it does, it will turn more and more into separate beams, with āholesā in between.
Small die with high surface brightness. We need an XR-E on Steroids. I wish there was enough interest from Cree to make a new one, with their newer technology.
Might be easier to make a light with water cooling or something, so that an existing small die could be pushed to very high amps. Maybe even some kind of nitrogen cooling or something.
