I was wondering of anyone has added LEDs to existing (battery style) LED taillights? I have a 5 LED Ikzi Light reflector/taillight - its an inexpensive, but for the (very low) price, I think its a nice, solidly built lamp with a decent sized reflector surface built in. The sides are completely clear and it has tons of room inside that seems as if it could be put to good use with additional LEDs. It already has 5 LEDs 3 face backwards, and two, one on each side face 90 degrees to the side. It does not blink, its a steady light. It has the two screws for mounting on a rear rack. Along the top rim, where the existing LEDs are, there is room for easily 4 or 6 more LEDs which is what I hope to do with some Phillips SuperFlux LEDs that I have, (decently bright) If I insert them along the top rim and get the spacing right, I think I can use the plastic optics, which is sort of a linear lens there - in the same manner as the LEDs that are in there now are doing. However, I dont want to attach them to the 2 AAs as the others are, as I would rather have them on a separate circuit that could run off of a dynamo.

Has anyone here done this kind of cheap reflector tail light additional LED retrofit?

The superflux LEDs are quite bright, considering their size. I think it could look very nice.

I also saw an idea recently that makes a lot of sense to me, brake lights..
Why not put microswitches in my brakes so that when I apply the brakes several additional LEDs are switched in? I also have a red 1 watt Luxeon Star I could use, but then I would worry about the heat since there is no ventilation inside the red plastic lamp. Of course, if it fits (just looking at it it looks as if it may) can attach the back of the luxeon to a small self adhesive heat sink (the kind that you can self-apply to hot PC components) and/or piece of aluminum or copper (an old penny?) or only use it as a brake light..

Is there some kind of national traffic car light spec for car or motorcycle lamps so that I can design my lamp additions to conform, sort of, to whatever visual language that is appropriate?