The first thing to do is decide if the light fixture is the problem or the light cover is the problem. Some don’t know that you can get replacement light covers and that you don’t need to replace the whole fixture. This could save you big when changing fluorescent light covers.
Next, we want to look at any distinguishing name on the light cover or the fixture itself. A good thing to remember is “light covers or replacement light panels are usually transversal between brands”. In other words brands like Lithonia and Keystone and or common sizes like t8 f34 fluorescent bulbs have universal donors. for example, let’s say you want to replacement for this light cover.