I've done the same thing (removing the ballast and replacing the tombstones) as my florescent lamps act up. I've wondered if I'm being cost effective - the LED bulbs cost $15 each at the local ACE hardware? I've not priced new LED fixtures, but it would bother me to throw out the old fixtures. So far I'm happy with the light. I now have 3 converted LED fixtures and 2 remaining T-8's.