He's referring to the screw-in compact flourescent lights that are made for lamps, etc. From what I understand these are not very suitable at all for a planted tank...light largely isn't directed downwards into the water, since they're meant for projecting light in all directions. They're also sort of small so I can't imagine that they would do a good job of evenly distributing light in the tank. They aren't incandescent, but they're not good for an aquarium either.Erirku said:HUH?
So, you say they use only 25w an hour or whatever the deal is, and the output of lighting is 100W X 2= 200WPG that means you have 6.67WPG, way too much light, and alot of new unwanted growth (algae).
Incadescents aren't that great either, they have a tendency to make the water warm or hot and aren't that great for plants for photosynthesis. If I were you I would get rid of that and go buy a compact fluorescent fixture for aquascaping. If you can't afford one, then I would go with www.ahsupply.com for money savings. Hopes this helps?