Well, you got to charge them with a flashlight. Once you do, that sucker is bright as all get out. Bright as the battery powered lighted recticles from Leupold. After about 1/2 hour, gets a tad dim. About 1/2 hour before daylight charge it, and by the time daylight hits, your set and don't need it anymore. Evening could be a little different. But the darker it is, the more the recticles will be noticable. You don't want it so bright that the contrast is too much or overpowers the view.