frequency of changing MH bulb

[ari5736]

How often do you generally change your double ended MH bulbs?

 

[lfsmarineguy]

at minimum I would say 1yr but there are a lot of things that can effect that. Some ballasts overclock lights, photoperiod on tank, blue spectrums tend to fade faster than the whiter ones, bulb manufacturer, it depends on a lot of things. I normally see anywhere from 6 months to 1 yr.