I installed these SeaLight bulbs a couple of weeks ago that are specific for motorcycles (led's mimic the halogen filament) and am very pleased with them so far.
SEALIGHT H4/9003 LED Motorcycle Headlight Bulb, High/Low Beam, 6000K Xenon White in Headlight Bulbs.
www.amazon.ca
The beam is focused the same as the halogen but the LED's appear much brighter and there's definitely more light coverage on dark roads. The most noticeable change is the color which goes from a muted yellow to bright white.
Here's with one LED installed:
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