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Frankly, I have a factory Maglite, that uses an LED and only 2 AA batteries, and this seems pretty dim for being installed on a five D battery Maglite, that said, its FAR better than the factory incandescent, a huge improvement that keeps the five cells models viable.
Price was good, I'd buy another for other 5 cells I still have that are currently not being used.
Replaced older original bulb that was still working but seemed dull. Seems like a much less fragile bulb but would normally be well protected anyway. Have not used long enough to talk about longevity but has worked well for at least 4 hours and no additional battery changes needed to be done. Much brighter then the bulb it replaced and not too hard to do either.
Used this as a replacement for the incandescent bulb in my 5 D-cell maglite. Huge improvement on illumination. Too soon to evaluate effect on battery life or durability. Hence the 4 star. Certainly much less expensive than replacing entire flashlight.