The thing I worry about is light saturation because I had that occur yesterday. I turned down the lights and the plants got better so I know it's a real deal.
I just came from using CFL's. The concept of TOO much light in 24 hours is foreign to me. ha! I have problems in my grow but not enough light now isn't one of them.
I have my lux meter and a dimmer on my lights, all I need are numbers to set my lights.
I also wonder if height has anything to do with intensity if you are using a dimmer. As long as I have a dimmer, I could set my height to 3' or 1' as long as it was 15k at the canopy. Is this true?