Cyclops works
And I will respectfully disagree with Teal (I guess) and say the Cyclops lights, though expensive, do work well with MX bikes (I have them on two YZ 450 bikes right now), no problems after 3-4 seasons. Where guys get into trouble is trying to run lights AND heated grips at the same time with MX bikes that have no batteries. Usually you can run both, BUT not at the same time. Quite a few other options out there if you don't want to spend quite so much $ with Cyclops. But Cyclops is top-notch customer service, the owner rides snowbikes, etc. and that to me is worth something when making an accessory purchase.