I just recently found out that Nite Ize makes an LED replacement bulb for C and D size flashlights. Looks like a good upgrade for my 4D cell Mag-Lite. I had seen other LED replacements previously, but they were expensive. Interestingly, it just says Mag-Lite . I would love to use it in my old US Army issue flashlight. I wonder why it only says Mag-Lite? Does Mag-Lite use a unique bulb size/voltage?

QUESTION: Does anyone know of smaller LED replacement bulbs? I have an old headlamp that I keep in my desk at work that uses a 4.5V incandescent bulb. Would be great to swap that out for an LED bulb. Can anyone direct me to a good website or ?

I'm not sure if this is a unique Petzl made bulb or a standard bulb. There's no nomenclature on the side of the bulb other than 'Petzl 4.5V'.