It's surprising how much difference there can be in perceived brightness with LED flashers, like the ones used for bicycles. I have a number, and the name-brand ones, like my Cateye, are definitely more "dazzling" to the eye than the no-name cheap ones I have. I don't think it's a matter of the amount of current sent to the LED's. I just think the more expensive unit uses better quality LED's IMHO.