Review on REPTI ZOO Reptile UVA UVB Light Bulb, UV 🦎 Test Card Kit, Spiral Compact Fluorescent Lamp - Enhanced UVB Bulb by Christopher Jones

I use this for a bearded dragon. Like most cages it has a metal mesh top and this bulb is housed in a reflector that sits just above the lid. It's 18 inches tall and when I put the card on the bottom of the tank it changes color quickly so I'm guessing enough UVB is falling that far. It only covers about half of the aquarium in this strong light (that's 40 gallons, so 36 inches long). So if you want to illuminate the entire aquarium with UV light, you need a second lamp.