Do my fans that cool my lights need to be on when my light is off?

Depends. If you have another fan bringing fresh air into the room with the correct CFM rate then you are fine. If you need your “grow light” fan to keep the air movement optimal, then I suggest running it all of the time. RULE OF THUMB FOR AIR MOVEMENT: If you do not know what CFM rating you need for the correct air exchange use this method: Multiply your room length by the width. Then, multiply by the height of the room. This is your air volume. Divide the air volume of the room by the CFM rating on your fan. You want a complete air exchange over under, every 5 minutes.

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