Gunshots
Nitrous
they also require a large (about the size of a Flourescent ballast) transformer. That will be hard to hide on a rocket.I got xenon bulbs from my dealer. They're much brighter but I don't think the pattern from the lamps is much different - ergo, they don't make that much difference on pitch black windy mountain roads.
Xsighting lighting makes a 5 3/4 lamp ($785 for 2). These are the most kick ass lights (Xenon/HID high and low beams) out there .