On an interesting side note. The hood for this tank had built in Tetra LEDs, marketed as ideal for plant growing. These leds measured Par 3 at the bulb and had no measurable par at the substrate.
Thank you for posting this. I've used the Sylvania compact fluorescents on 5 of my 6 tanks for years, and the clamp light fixtures are especially good because they hold the CFLs in the vertical position. CFLs produce significantly more light (for aquarium purposes) when mounted vertically in a reflector. The reasons are complex and are mostly due to a phenomenon known as restrike.
Planted tank enthusiasts, throw off your chains! Effective aquarium lighting can be cheap and easy.