found this from member William quilles

http://www.atdms.com/tutorial_modifying_flashlights_page1.html

well worth a read and great pictures.

wow
his equipment makes me drool

Thanks for that, very helpful.
Cheers

FTA:

“The other significant challenge that bulbs face, is that when the filament is cold (it has not been used in a while) its resistance to current is much lower than once in operation, so it suffers from a current spike when voltage is first applied. This is the reason most bulbs in the home die after a while - and they don’t die while they are ON, they die when you first turn them ON.”

I didn’t know that, but it makes perfect sense! He also raises a good point about the spectrums of LED and incandescent, I hope one day we can get the same spectrum from an LED source.

he goes by the name wquiles in cpf, he does awesome work!