But I am going to have to take a look at these LEDs. Give me some details.
I will try.
These LED bulbs, regardless of brand, have either Philips Luxeon or Cree LED chips in them. The heatsink is very innovative, consisting of tinned copper braiding which makes it flexible, so that the bulb will fit into the most cramped of spaces. Not that the bulb itself gets hot - it doesn't - the heatsink is there to keep the actual LED chip cool by convection without resorting to a fan. I can't tell you about availability but there are sellers on eBay. These bulbs are meant for cars, so they are usually sold in pairs. Example:
The air cooled twins use the H4. The bulb still has a small inline box that houses the driver circuitry but that is very small and will fit easily inside the headlamp bucket. On eBay watch out for sellers that claim a light output of around 6000 lumen, although this is true it is the total
output of a pair
of bulbs and can be misleading.
I know the draw on the system is nothing with LEDs compared to a halogen lamp. Plus they are brighter??
Comparing the bulb I have in my bike to a stock 60/55w halogen bulb, the LED draws 20w per filament (20/20w). Concerning brightness, on high beam the halogen puts out around 1500 lumens. The LED, on either beam puts out around 3200 lumens.
One thing I can tell you is the beam pattern of the LED may take some getting used to. The halogen has a more defined cutoff point, whereas the LED has a slightly wider spread. Although you can see more/further with the LED especially on an unlit road at night it feels a little strange at first, not having that sharply defined spot of light that you are used to, although it is still there. I can now see my low beam reflected from the car in front in the daytime whereas the halogen showed nothing. The Cibie lens provides excellent diffusing.