Greenlite Lighting 13W/Q/4P/35K 13-Watt Quad Tube Plug-In 4-Pin CFL Lamp, Medium White 13-Watt Quad Tube Plug-In 4-Pin CFL Lamp-Medium White Uses 75-Percent less energy 1 Greenlite bulb equals 10 standard incandescent bulbs Instant start, flicker free 35K color temperature