I just wanted to share this kinda neat little discovery. My brother's nightster has the smoked rear lenses installed which of course act as both marker and brake lights. He needed a new bulb and they have to be red with those lenses. Two local auto parts stores didn't have the red ones just clear and amber so he thought why not use a red sharpie on a clear bulb. Works better than the ones he had on there, brighter and cooler looking red! So far so good!