Originally Posted by jputnam

If you're using a truly vintage housing, you might just need to get good thermal bonding between the LED heat sink and the vast expanse of chromed brass shell. I used to have an LED head inside an old Union lamp, U100 perhaps, and the metal case had more surface area than most compact LED heat sinks. I used heat sink paste from my computer to get good thermal contact and it worked beautifully until the light fell off on the freeway when I had the bike on a bus...