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These aren't as bright as I expected, but that might be a good thing if I'm in a survival situation in which I don't want to be seen. They seem to be bright enough to accomplish small tasks, close-up. Over-all, I'm happy with this purchase.
Not very bright but then again none of the red lights are . Bright enough to read a map or plot an azimuth at night in pitch black condition without ruining your eyes natural night vision. Have not tested them with infrared yet hopefully soon. These stay illuminated for more than 12 hours . Fyi: to make them last longer warm them up. Hot water ,or roll them between your hands to extend thier life.