Planted Tank Enthusiast
Join Date: Nov 2008
Location: Morgan Hill, CA
I think you mean "compact" fluorescent, more commonly called CFL (they are spiral lights, right?).
I'm not a lighting expert, but CFLs on the hood you have is probably your least efficient 26w fluorescent lighting option, so I would say you are on the high end of low light.
As for placement, many people raise their lighting fixtures to lower the intensity and/or give a more uniform distribution. It's a good way to tweak your lighting to get just the right intensity, but is not really an option with your fixture.
BTW, your lighting will be pretty intense, relatively speaking, in the center back compared to the corners. That type of setup does not give very uniform lighting, especially high in the corners, which get very little light.