<a href=showthread.php?s=&postid=6567707#post6567707 target=_blank>Originally posted</a> by dannieboiz I have HQI bulbs on HQI ballast how often should the bulbs be replaced?
I have 250-watt 10,000K DE AB bulbs in PFO Minis that have been running for 5 Ã"šÃ‚½ hours a day for 16 months. Every once in a while I check them with a PAR meter to ensure there isnââ"šÂ¬Ã¢"žÂ¢t a significant decrease in intensity. Last time I checked (about a week ago) they were still going strong. Iââ"šÂ¬Ã¢"žÂ¢m counting on them lasting for somewhere around two years before they need to be changed.
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