Lumens: 900 Wattage: 13W Color Temp: 4100K Life Hours: 12,000 Base Type: G24q-1 Suitable for electronic ballasts, the Philips 38328-1 CFL operates at 13 watts and has a 4-pin, G24q-1 base. The high quality double tubes emit brilliant cool white 4100K color temperature. Best when used for long operating times, this lamp is great for downlight and wall washing fixtures. Beyond saving money on utilities, this lamp is rated for 12,000 life hours meaning it will far outlast competing incandescent bulbs.