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12-01-2010, 05:12 AM #2Senior Member
how many grows on a bulb?
Hello Stellybutton,
Welcome to the boards. Sorry nobody piped up on this, so I'll give you my take.
I'm a firm believer in changing out HPS bulbs after 2 grow cyles of 12/12 or abt 16 weeks or so of use.
I just mentioned somewhere else that just 10hrs of use equals a loss of abt 20% of the Intial lumens you started with and it continues down steadily after that. That BTW is according to Hortilux, that makes some pricey bulbs.
I use cheap "generic" bulbs and buy them by cases of 6 at a time.
Tho recently in a partnered grow I sprung for some PSMHs from SunPulse (1000w) and they cost abt $160 each, sooo I might try to use them longer. Wait, I already have.Time for me to check them with a light meter.
OM
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