A summary thread on lighting

[Andre]

I have a 8 bulb t5 fixture with 4 foot 54 watt full spectrum tubes. How close is too close (other than overheating plants), how far should I place my Catts. If they are very close (5 inches) do I only get the benefit of two or three of the tubes versus the benefit of all 8 tubes. I grow Catt. walkerianas, and nobiliors. They are not booming but some of them have a suntan. Tubes are on for 13-14 hours.