When do you change your bulbs?

Pinstripes

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I have 28 JBJ Nano HQI Cube been running for almost a year now. The corals look fine but i read I should change my bulbs every 6-9 months?

pinstripes
 

Russellaqua

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Every 6 months is a good idea. Bulbs lose intensity over time and a new bulb replacing a severely overused one can shock the corals by suddenly being much brighter, even at the same wattage. I replace mine every 6 months.
 

Paul_N

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I run my MH bulbs 5 hours a day so I get a year and half out of them. Most of the drop off in MH lamps occurs in the first 3 months. after that the drop off until 18 months is not that much.
 
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