StandbySetting
Fish Aficionado
Look at the spectrum diagram given with the product, the graph will have peaks on it in certain places, look for tubes with peaks in blue, red and yellow, though I've not seen many that peak in yellow, personally for what it's worth I'd just go with T8's, for what you pay for two T6's, you could probably buy 6*T8 tubes.
you're definately right about the price difference!! do you think this tube will do red, blues and yellows?? do you know if it's any good
/www.lampspecs.co.uk/Light-Bulbs-Tubes/15-Watt-18-Inch_2/18-In-Fluorescent-Tube-15W-Natural-25-15-Watt