This T5 tri-phosphor 2-pin plug-in Compact Fluorescent Lamp (CFL) in a Quad Tube design features durable, high-quality components and advanced technology for outstanding performance. As a result, this light bulb offers a number of significant advantages over incandescent bulbs: it consumes up to 70% less energy, generates less heat and features a 10,000-hour rated life span so it needs to be replaced less often.