JBWeld and thermal transfer?

[WildRice]

hey ya'll,

I have a 1W emitter in a MOD, I origanilly had the star base on it but it was sitting too high for my liking. I removed the emiter and 'welded' it in place. the mod is a 6vlantern battery(LiION now) light, I filled the original hole for the light in the reflector with JBWeld to use the aluminum cathode ring as a sink. With the star on this 3/8" by 1" long slug of epoxy, how would the thermal dissipation be?
BTW power is 50mA on and 370mA momentary. How long could this be safely driven at full power.
Thanx
Jeff

 

[Justintoxicated]

JB weld has little to no thermal disipation.

 

[gadget_lover]

At 50 ma, you should be able to go a long time. The data sheet said 100 ma max without heat sink. Does the temperature stabilize?

Daniel

 

[Justintoxicated]

I cheap trick I hever personaly never used on my computer parts, is to use regular thermal past on the majority of the part(heat sink slug) then use adhesive on the corners or edges to keep the HW in place. THe thermal gunk in the center will transfer heat better than thermal epoxy. It is mroe of a pain in the *** and the emitter would not be held in place as much as epoxy though, so I do not used this method. I have also heard of people mixing AS3 with superglue and using that, but I don't use this either...Too risky for me.

But from my understanding JB weld really sucks for thermal transfer, I hear that even peanut butter works better.

 

[Justintoxicated]

damn, why can't I edit my post? Guess you have to get it right the first time now?

 

[snakebite]

i have found that jbweld in a thin layer makes a fine thermal adhesive.i have even potted luxeons in pr bases and then filled the remainder of the bulb receptical with jb on a b&d spotliter sl20.
it may not be the best but it is somewhat usefull.