Hey koto, Im only using GrowMau5 Puck, which is only 7watts. I run it all day, and 15 minutes when light cycle is out at end of day.
My grow is actually complicated,lol.
I grow 12/12 from seed almost exclusively. I run 4 Luminus cobs, 2x3500K-80CRI and 2x4000K-90 CRI
First 4 hours of day, i run 150watts of 3500K, 50 watts of the 4000K, middle 4 hours i use all 4 @ 300 watts, last 4 hours, 150 watts 4000K and 50 watts 3500K..
Things Ive noticed- 4000K grow a taller plant, slower pistil formation, 3500K shorter plant, faster pistil formation.
So i changed the pots around, and the laggin has almost caught up, but flower stretch is pretty much over, so now its just stacking of the top cola bud. I didnt top these testers, for testing purposes. But then, i did cut the lower fan leaves off the nodes on the smaller plant, so that might have slowed it. Also, the taller one is in a corner of the grow area, which might have been getting more light because of the reflection reasons. Where as the smaller, didnt have a corner. My space is 3.5 ftx 6 ft, but use the back of the area for my light to cover the 3.5x3.5 area.
So, i guess, theoretically speaking, the experiment is a wash, lol..