You could use the light, but the ends of the tank are going to look very dim. To some people this doesn't matter and they plant low light plants there. For myself, I can't stand those dim ends and would upgrade the lighting one way or another, even if I had to use a dual T12 bulb shop light.
You could certainly give the fixture you have a try and see how you like it. If it works for you, you saved yourself a lot of money. If not, your no worse off.
You could certainly give the fixture you have a try and see how you like it. If it works for you, you saved yourself a lot of money. If not, your no worse off.
