ECN Forum Forums General Topics of the Trade General Discussion Area photocell requirement for metal halide ballasts

Ballasts seem to have no set 'average.' Some seem to die after a year; another put in, right next to it, on the same circuit, will last over a decade.

If I were to try to guess at a pattern, I'd look back at one job I maintain .... 13 years, 18 ballasts like yours, and I've had to replace two.

Bulbs seem to last 2-3 years.