Wouldn't you need to replace the "reflectors" for reflectors, plus endcaps?
I'm no electrician but it sounds like loose wiring. Does the flickering change intensity when you move the wiring around?

Quote Originally Posted by Gseclipse02 View Post
It may be better to just put t5's in the fixture. Check what the ballast says the one I has was good for t5's also so I just switched them out