T5 is a bulb type designation, like T8, T12, and CFL (compact Fluorescent). There is no T5 compact bulb. You can either have a T5 fluorescent bulb or a Compact fluorescent bulb, NOT both combined. T5, T8, and T12 are all Linear bulbs, the higher the number the larger and less efficient the bulb. Compact fluorescent are the "curly" bulbs we have all seen, and are not recommended and are less efficient than T5.Good. But you also get t5 compact bulbs that is why I asked
Sorry if this came off as preachy, not my intent. I have been keeping reptiles and reef aquariums for many years and have used virtually every type of lighting made. Including Power compacts, T5, T8, T12, CFL, LED, Halogen, Metal Halide, Mercury Vapor, etc. While I am not an "EXPERT", I have picked up some lighting knowledge along the way.