I run mine for 10 hours, just so it will grow faster.
Doesn't take much light.
I picked up a clap light and flood light bulbs from Lowe's about $15 a set. I have 2 running on my fug. 18watt lights rated at 95W 6500K
Got the idea from this GURU. http://www.melevsreef.com/fuge_bulb.html