Bio cube experts help me out

There's four switches on top for the lights....when I turn on one of them a fan seems to come on...what's that for?
 
Cooling off the bulbs but only when you have all the lights on , or the 10,000k day light on that's how it works on my biocube

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+1, I changed the bulbs around so they came on/turned off with the actinic lights instead of the whites
 
Cooling off the bulbs but only when you have all the lights on , or the 10,000k day light on that's how it works on my biocube

Sent Via the R2R Forum APP

So you can have all he lights on at the same time?
 

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