these be fine in they day , but have be eclipse by much better , brighter aa or aaa flashlight . I decide to try upgrade two old one I own to the newer led and xenon bulb . both bulb be available at the box store and very reasonable . sadly , neither bulb do much to improve the amount of light these Mini MagLites produce . I do not test lumen or anything like that . I just add fresh battery , turn they on in a room with daylight come into it , and you could just see a small circle of light on the wall at 6 ' . at 8 ' they be almost invisible . better technology have pass these by .