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HPS bulb lifespan?


Plant of the Month Winner - December 2011
I have a Hortilux Eye, 400w hps bulb that has illuminated 4 grows now. I know its says something like 24,000 hours, but I thought I read somewhere they are only good for so many cycles before they loose efficiency.

Thanks! :peace:


New Member
Since all HID bulbs degrade over time (meaning they draw the same amount of power but output less lumens), a general rule of thumb would be to exchange bulbs after half their advertised lifetime (in your case, 12,000 hours).

I have read that a lot of growers exchange their bulbs after two grows; depending on how much you pay for electricity and how much bud you want, you may find this economical as well.


New Member
It is well documented and tested that the bulbs lose their intensity within the first year or two. I'd follow harrad's advice, his numbers are right on.
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