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I have a 10,000K Metal Halide along with two 20 watt fluorescent bulbs encased in a hood. My question is, the hood had a fan but now the fan has stopped working. Do I need to have a fan on the hood? What will happen if I do not replace the fan?
Any advice would be helpful.
 

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Seeing how MH lights run extremely hot, I would say yes. Depending on how your hood is set up would determine how needed it is.
 

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Lights can really heat up the water and most plants really dislike warm temps.! I would keep a very close eye on water temp. but honestly you will probably end up needing some air moving in there.
 
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