I am planning to upgrade the bulbs on the unit. It is in storage so I cant read the bulb types and when I use what is in the manual, they dont understand H1L and H1U. I think it stands for H1 low beam and H1 High beam. I also understand that the low beam has two filiments and the high beam only has one. I have read that the low beam takes an H4 and the High takes an H1. Does anyone know what the bulbs actually are?