Maybe not constantly, but almost daily. On automatics, the lamps light up briefly every time the car is taken from Park to Drive because the selector goes past the Reverse position, so if you have an automatic you're lighting them up more often than you think. At night, they seem to help me see better than the incandescents in my Corolla did. And they'll potentially never burn out. On some cars, changing the reversing lamp bulbs is a very involved process; the Previa required taking the entire interior panel from the back hatch. On that one, I'd rather do it once and forget it!
