Hi!
I know the failure modes of HPS lamps (cycling, sodium loss, etc.) but I don't know how SOX lamps typically fail, since they work more like a fluorescent tube and contain lots of sodium. My only guess is eventual electrode depletion, but I don't know what that translates to in a well used or EOL SOX lamp. Suppose I have a brand new SOX lamp, run for a few hours a week, how long do you think it may last?