<a href=showthread.php?s=&postid=7076815#post7076815 target=_blank>Originally posted</a> by AcroSteve
Are you talking actinic only, or other types?
Actinics are less critical and can be run much longer, IMO. I have two 6' bulbs that are over 2 years old.
If VHO's where my primary lights, I would never run them that long.
12 months max.