Arcadia D3+ Reptile T5 Lamp 12% has a greater output and better level of energy efficiency than the old T8 models.This Arcadia D3+ Reptile T5 Lamp 12% UVB range uses fluorescent tube technology to deliver a high amount of essential UVB light to your reptile, perfect for desert species that need around 12%. Available in 24w(22"), 39w(34") and 54w(46")