Depends on the fixture, my T5 48" fixture only works with 2 good bulbs in it. If either goes bad they both go out and stay out until I replace the bad bulb. Pretty typical for multiple bulb flourescent fixtures.
46 gallon bowfront, Dalmatian Mollies, Swordtails, Otos
75 gallon Lake Malawi African Cichlids
3 gallon nano desktop with Betta at the office
Last edited by robbob2112; 09-23-2008 at 08:53 PM.