Question - Why do G2Ls' still have metal heads?

Their new emitters/driver setups in the 120Lumen versions shouldn't be producing enough heat to warrant a metal head, should they? The G2Ls' would also be much more attractive with the nitrolon heads.

Not sure, my 80 lumen G2L yellow came with an aluminum head, I appreciated it because I'm now running a warm tint 200+ lumen dropin in it. I haven't seen a nitrolon head anywhere but eBay in the last few months

Because aluminum is better than Nitrolon.

Roflmao

I've left my KX4 on non-stop for about 20 mins and the head got pretty warm.... better safe then sorry.

I believe that there were a few issues of overheating with first generation G2L's. So Surefire changed the head to an aluminium design to allow for greater heat dissipation.

Dr Jekell said:

I believe that there were a few issues of overheating with first generation G2L's.

Click to expand...

I don't know if this is correct - are you able to cite a reference for this?

The SF P60LED module had an additional thermal regulation feature - it would throttle the output of the module down depending on how much it heated up. Upon turn- on, the output would be 80 lumens, going down to ~60 lumens after 5-10 minutes IIRC from looking at the output graph. The heat & output of that module would stabilize at that figure in an aluminum head, but would further throttle down to ~50 lumens in a nitrolon head.

My guess is that SF understood that this was a non-optimal configuration and began spec'ing the aluminum head on the G2L's.

I can't recall ever reading a report here on CPF regarding the failure of this feature and subsequent overheating of a P60LED module, although I assume it's theoretically possible. More likely would be a decreased overall lifespan of the LED, but IIRC what few CPF reports there were of defective P60LED dropins were that they were DOA from a defect in manufacture rather than overheating during use.

Do what i did run 17670 so lower voltage and still use nitrolon head

I with you KDOG3, I'm not a fan of mixing aluminium and nitrolon parts. It's just not right.

What ever happened to your alter ego KDOG4?

Kestrel said:

The SF P60LED module had an additional thermal regulation feature - it would throttle the output of the module down depending on how much it heated up. Upon turn- on, the output would be 80 lumens, going down to ~60 lumens after 5-10 minutes IIRC from looking at the output graph. The heat & output of that module would stabilize at that figure in an aluminum head, but would further throttle down to ~50 lumens in a nitrolon head.

My guess is that SF understood that this was a non-optimal configuration and began spec'ing the aluminum head on the G2L's.

Click to expand...

This sounds closer to what I remember.