I'm working on a aspheric lgith. I'm Thinking of using a peltier to cool the led, run the led at around 2 amps, machining a costum light, and controlling the peltier with a attiny 13a and a transistor. I found out that the five cree xre q5 leds I have are ez900 ones. I discovered that after accidentally de doming 2 of them when desoldering. . That was sad. I can't find any tests that show at which temperature they run the best. I saw one test here that showed someone got almost 500 lumens out of one with a similar setup.
I'm thinking of using the 62mm dx aspheric if I can't find any nice large ones. I'm took 2 old pennies, sanded and then soldered them together, drilled a 3/16 hole through them and soldered a brass piece of rod in. I couldn't find any copper rod. I'm planning on directly soldering the led to it and sanding the rod down to a few mm above the pennies. I'm going to solder the pennies to 1/4" thick piece of copper to act as a heat spreader for the tec.
How does this sound?