I can tell the haters one thing...in one week I germinated and popped those seedling under that 1000w MH...I had a 95% germ rate and 100% seedlings popping out of the soil thriving under that light, loving it rate.

What is 1 to 20 feet...

anyway I'm covering a 5x5 area with some plants I'm nursing back to health on the sideline.Great circulation,fresh air,good temp...what are you asking if anything?

In my opinion floro's are good for 1 thing clones and seedlings.The day I flower under a floro light I will have become a desperate man.