11-07-2009, 07:06 PM
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Originally Posted by Byron
T12 and T8 fluorescent tubes come in standard wattages for the tube length, e.g., 48 inch tubes are 40 watts. Some manufacturers have lower-wattage tubes, e.g., Zoo Med's 48 inch are 32 watts. This is an energy-saving thing, less wattage = less energy but the tubes are made (the coatings inside) to produce comparable light intensity as the 40w. So if your fixture is a certain length, the tubes that will fit will be one wattage (or comparable as mentioned). Plus the info that WisFish mentioned, follow the max on the fixture.
What size is the tank (gallons, plus length)? And what type of plants are you wanting? Might have some suggestions after knowing this.
tank is 30 gallon (36" long) I currently have 1 amazon sword, 3 hornwort and 1 Java fern with various seedlings of the hornwort and java fern in the tank. I just want to provide a little more light because I think my sword is starving. Fertilizer (seachem) not helping much. Leaves are green but new leaves are growing in "thinner" than existing ones, nearly transparent. Don't think it is co2 issue since the other plants are thriving.
With a 20w florescent inthere im getting .7-.8 watts per gallon...I bit low methinks.