I replaced my stock bulb (which put yellow light and wasn't very bright) with a generic superwhite bulb. Like $12. My friend has the identical bulbs in his bike, a '96 YZF 600 and he's had no problems. I'm on my second one because the first one had the low beam burn out. This time I kept it on high beam most of the time and last weekend I went to put it on low beam and it was burned out again. It's the same wattage rating as the stock... 60/55... on a 1992 CBR 600.