Sounding off here, I am an avid Kessil grower. My first grows were with CFL only, and I quickly realized I needed to reduce heat in my envirornment. I started with a single H350 suspended over my bubblicious plant, and cfl's as side light. I ended up with some plump flowers as a result. For my next grow, I added a second H350, and ditched the cfl's! I got an even bigger yield with larger colas! I am now adding H150 boosters to my setup, in prder to add more red and blue side light.