I left my back up lights clear and really like the looks of them done that way. But like GMCwantsla1 said if your in town most of the time completly black'em out. I got tired of rolling the window down and sticking my head out so i could see backing up.
David,
2003 GMC Sierra Denali, LQ4, AWD, AWS, 4.10, Wheatley 93 tune, LT headers, GMPP CAI, BBK 80mm TB, MSD wires, E3 plugs, 160* T-stat, Flowmonster DI/DO, cutouts. Working on 4.8 heads, just purchased Comp 228R cam, 918 Springs, TI retainers, 7.4 hardend pushrods,