35 watts, I tested the 55 watt sets and they use the 35 watt bulb with a 55 watt ballast, an d some of the 55 watt ballast were only 35 watt so son't believe every sticker you read. Using the 35 watt bulbs is why the 55 watt sets are only a few dollars more. The 55 watt ballast scatters the lite in the 35 watt bulb. The only company I found to make the 55 watt bulb is Philips and the costs of a 55 watt build is a couple of $100. As for the color I use it's 4300 k for the bi-xenon and 6000 k for the high beams. I like the 4300 cause it throws more light, which helps in the rain. I had 6000 k before and that's why my hi bean is 6000. I'll change them when one burns.