I have seen several posts here about them being the most inefficient
fluoro lighting you can get - in terms of lighting a tank uniformly.

Ah. In that case, it's probably a matter of tank size. Your tank is quite
small. So it's adequately lighted by two globe-sized bulbs. It wouldn't work
as well on a 4' long tank.


Leigh

http://www.fortunecity.com/lavender/halloween/881/