Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
A stock light that only holds one bulb (T-8 or T-12) is not enough even for a low tech tank.
I run my 45 gallon tanks (4' long, but not as deep as a 55) using any of several fixtures, but they all have at least 2 bulbs.
My 72 gallon bowfront (4' long, 2' deep) has 2 of home depot shop light fixtures with 2 bulbs each (4 bulbs total), and some direct sun. It is barely more than low light. (Better reflectors are my next project)
I use a mix of bulbs, including 'daylight', 'cool white', 'plant and aquarium' and some others.