David, those are the exact fixtures I use with T8 daylight bulbs. They're inexpensive and have worked great - going on fifth year now. I tossed the S hooks and chains, though - with adjusting the height, it was too easy for the fixtures to fall on the plants, so I made my own out of wire that are fully fastened to the fixture and also wrap all the way around the ropes I hang them with so I can raise or lower without any chance of fixture falling.
