changing bulbs

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Aquarium Advice Newbie
Jan 2, 2007
i have three 175watt 20,000K HQI bulbs in my canopy can i put 150watt
14,000K bulbs in without damage to ballast?
There are some ballasts that are made for 150/175 but usually the clip is different.

Are they electronic or PFO and what is the name of the ballast?
I'm going to move this to the general hardware/equipment section.
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