Originally Posted by
znomit
Im running 4 crees at 500mA in an Al housing off a bflex. They do not get hot at all when riding...slightly warm to the touch but only in comparison to the bike frame. A heat sink is not needed, well maybe if you plan to ride a lot a 1mph. As long as there is a good thermal path from the LEDs to the case they will be fine.
Do you need the cross bits separating the LEDs?
Yah, I didn't think that the housing would get too hot. I'll be running this setup at 700 mA, and the ambient temperature will usually be between +10C and -30C [-50C with windchill]. As to the cross bits, I guess they aren't needed, since the LEDs+lenses are attached to the plate in the middle, which will be in contact with the casing. I will probably leave them in there, but if I wanted to eliminate them I'd switch to 2"x2" square tubing instead of using 1"x1".
Any other suggestions?