those LED's don't sound so good any more, I just checked the lable on a new 13 watt CF, and it's rated at 800 lumens, so those 800 lumen 20 watt LED's are sounding less great only 40 lumens per watt insted of 61, if only CF bulbs fit in head lights.
found a few more:
50 watt LED (wow) but it's only 1,700 lumens, only 34 lumens per watt.
3 watt, 80 lumen around 26 lumens per watt, and that seems to be pretty standared for something that can run for more then just a minute or two.
but this is the best I've found!
1.3 to 3.7 watt, 107 to 228 lumens (depending on how you regulate them) $9 each $8 if you buy 3 or more, but it also needs a driver that is going to regulate the voltage very carfully to keep it from burning up, but I think if 5 or more of those were mounted in a reflector, with good heat sinks (still like the heat pipe chanaling heat to defrost the windsheild) and had them at full driven power for high beams, and I like them because they give you specs over a wide range of amps going thru them, and if you don't need them as bright they are more efficent!
as for tail lights, I already use LED tail lights, they are brighter and use less power then standard bulbs, I personaly tested them at less then 3 watts each.