This would suit the UK/EU owners more then the US ones, it's a simpler board than the one currently on offer from bubmrtn
with no integrated turn signals.
The idea is that a UK bike will pass an MoT test with one fitted, but still have a much brighter rear light than an aftermarket LED bulb. They use red LEDs so will work with either red, clear or smoke/iridium lenses. (They look orange in the pics, but they are red in reality.)
Also unlike LED bulbs, I have kept the tail and brake lights apart, each having their own circuit. This means I can use different types of LEDs for each part, resulting in a MUCH bigger difference between the tail and brake light brightness when compared to any LED bulbs I've seen.
These boards are similar in brightness to regular filament bulbs, slightly brighter if anything, but will last a whole lot longer with normal use and use less power drawing under 500mA.
The price is £27 inc. UK postage. They will be on e-bay occasionally, but they will be priced at £35 on there, so it's better for you to buy them through this site.
Fitting is easy, a small amount of silicon sealant or similar will hold them in place, and three crimps (which come with the board) need to be fixed to the bike's tail light wires. Fitting instructions will be e-mailed to you, but it really is easy to do.
I'll get some pictures of it on a bike as soon as I can. The back ground gets progressively darker as the camera has to compensate for the brightness of the LEDs, giving some idea of how bright they actually are.
And on a bike: