I used halogen. I will replace with led. It works great, the downside is when I drive slow the bike can not make enough power to sustain the lighting draw. It does work perfect going about 30. Works for 20 min. Or so going slow in technical stuff. If I turn of high beam or aux lights goes back to normal. I do not use or need them all the time but if you have ever rode in the desert at night you know the stock light is useless when ridding up a steep windy dirt hill. The side lights let you see the next obstacle before you turn into it.