I wanted a brighter, whiter light than stock without getting the HID and found this bulb to be plenty bright enough and there is a slight tint of purple on low beams but it isn't extremely noticeable. Very happy with purchase, installation was quick, didn't have to unscrew a thing on my yamaha yzf600r.
PIAA H4 Super Plasma GT-X Bulb
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This bulb is much brighter than the stock bulb on my 06 Heritage Classic. I have read reviews on this bulb that it didn't last long, but the Super Plasma GTX worked for well over 40,000 miles over about 4 years. The only reason I didn't buy it again was because Motosport had the Extreme white plus bulb for about half the price of the Super Plasma.