Re: What are the brightest 5mm white leds availble
the previously mentioned MJLED is the brightest 5mm led I've ever seen (but they have to be used with a reflector since they are not focused). My MJLED in a MiniMag (mag 2AA) blows away every light I've upgraded with the 26K mcd units I got from ebay. If the light you are going to upgrade doesn't have a reflector, or is tiny (ie like a mag solitaire) then the 26K would probably suit you better. MJLEDs have been available in the past from users here on CPF, but I don't know of any current sources.
I just purchased, but haven't recieved yet a similar led to the MJLED from
the shop go to mod shop then LEDs. They are labled as Uncut High Power White 5mm/25degree LED **NEW** and MJ Cutdown High-power 5mm LED *NEW*
I don't know if anyone has reviews for them yet or not, i haven't seen anything though