What is the longest lasting battery powered LED lite available?

I'm working on an art project project and need a small light just to add a back glow to a picture. Just need something that is battery powered, can provide a glow and will last a long time. Longest I've found was a bike tail light that lasted 150 hours before the battery ran out.

Hi Gideon,

I don't know of anything longer then the 150 hour one you found but what you can do is wire up a parallel battery pack.

By putting them in parallel the voltage remains the same but the capacity increases. Ten batteries in parallel would run 1500 hours or about 62 days.

Norm

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