So many people have been super successful with 24/0 light that it's hard to argue that it doesn't work. But I've never seen a comparison between the growth of 18/6 and 24/0 so hard to say for sure.

Also if you're worried about the temp dropping too low, then the lights being on all the time is going to generate some heat which in turn will keep it warmer in the room than if they're off. Just a thought.
Marc Benson Reviewed by Marc Benson on . do i need to keep the fan on 24/7? reason im askin cause its gettin cooler especially in ireland, and keepin the fan on with the lights off @ night, wont it make it even colder and wont that b bad 4 the plants? peace p.s they r still only early in veg if thats any help... Rating: 5