I'm in central Florida where temps have been near 80 & sunny since I got these. Under those conditions - i.e. direct sun beating down on them for 7 hours - they emit light for about 5 hours into the night. They are always dead by 2am. Today we had our first cloudy day in a while. Lights came on at twilight, but only had enough charge to stay lit for about 1 hr. If that's what you're looking for, these are easy to set up. They're also not too bright, so you may need more than you think to get the effect you're after.
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