Helen, t12 will be the dimmest of the tubes. T8 and next brightest and T5 are the brightest. They are not interchangeable. Your fixture is designed for one type bulb and that's what you need to buy. Increase the light by moving the plants closer to the bulbs.
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Ross
http://orchids-ross.blogspot.com/
I don't do most Dendros or large, "floofy orchids". For me it's minis (like Angraecoides), Masdies, Paphs, and others that crept in somewhere along the line. See my orchid list for complete collection (usually not current.)
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