TL;DR version below
awhile back I put an xhp70 in a supfire L3 host, fet driven, and was really impressed, for the first 10 seconds on high... The beam slowly faded to blue! I can drop down to medium and it is the original tint again, switch to high and 5 seconds it fades to blue! I guess the timing is due to the heat soak, and a preheated heatsink vs a cold one. Anyway I wrote it off as a failure, and since I have remodded it 3 times over, the first time I added a second noctigon mcpcb hoping that more copper under the LeD would do the trick. The second time I pulled the driver out and turned a 15mmx(ID of pill) chunk of copper round stock to press up inside the pill with grooves on the side for the wires since there was so much dead space in there. The third time I had the displeasure of pressing the copper chunk back out of the pill, and removing the extra star I had under the mcpcb(which I had "milled flat" with a piece of 800 grit sandpaper, a formica countertop and 30 minutes of elbow grease, then soldered together of course) and reinstalling things like they would come stock, with a couple dabs of artic ceramique 2, screwed down tight into the pill. I had to drill and tap the holes for the tiny computer screws....all to get back to the original issue of a beam that fades to blue. Nothing helped. The light has been sitting in my flashlight toolbox for months collecting dust.
Anyway TL;DR version
I've been noticing alot in high output high end flashlights that all the beamshots are of a blue beam. The javelot, tm36vn, ect ect... So is it just a normal occurance for overdriven LEDs to have a blue beam? I've gone above and beyond with adding extra heatsinking in this flashlight and it is definitely pulling heat away judging by the heat going to the host... It has a pretty intense beam shooting out, even when it's blue. Should I just use it until it blows or try a different LED in the host?