Mine are T-8's. Are the T-12's the thicker ones?DigginWithJon said:Do you use the T12's journey? I have many shelves that still use them, but since they are now being phased out I am switching over to this CFL setup per shelf as the T12s run outta life. Them being phased out means that they no longer make new T12 bulbs, so the price will go up fast as current stock sells out. T-8's and T-5's are around - T-5 being better, but the cost is still quite high. One of the things that seem to really make these CFL's smart is that you can change out some of the bulbs for different spectrum and more or less light. So you can use the 60 Watt equivalent for things requiring less light, and the 100 watt equivalent for the plants requiring lots of light. They are super bright so you need some kind of reflector or blocker to keep them from blinding you.