Originally Posted by mnangler
You all answered my question.... also, the weird flashing stopped after I took apart the light and re-secured a few of the wire nuts internally. The physical dimensions of the new bulb are exactly the same as the previous bulb and fit perfectly into the fixture. Looks like I'm good to go, although I really think I'm going to need a double fixture with two lights for these plants to thrive.
I tried T5 over my 75 gallon tank for plants and the lighting just was not strong enough for much to survive. I have had great luck with HOT5, however. Wisteria, bacopa, Amazon swords... all thrive in the 75 gallon tank with the HOT5.
While spectrum does affect plant growth, the wattage is just as important to watch. A standard T5 fixture just is not enough wattage for the depth of a 75 gallon tank. I have a T5 fixture over my 30 gallon salamander tank and can grow almost any plant I want in there... It sounds as if you simply need more wattage over your tank.