I know hun. But you misunderstood... Yes it is the 5.0 but you bought a compact florescent bulb not a 5.0 T5HO bulb.I got the UVB bulb I was told to get by someone on here. I also have her heating bulb. so I’m a little confused still. So I need a bigger uvb bulb? It’s the 5.0 UVB but I have the smaller size.