Is this enough light?

[naoki]

ewhite, I agree with Bill, and I think that it is probably appropriate amount of light for Phals and low light paphs. For 4x2' area, I had success with 4-6x 32W T8 (similar to 2-3x 54W T5HO). CFL is generally less efficient than linear fluorescent light, but your setup should work. With LED, I seem to be able to go down to 80-100W for 4x2' area. Here, I'm talking about 100% artificial light, so if you can use some natural light, the requirement could be lower.

Since you have reflectors from studio lights, you probably know about photography. You can use your camera to measure foot-candle if you want:
Light Intensity Measurement