Operating at only five watts, Sylvania 21279 Dulux S T4 plug-in compact fluorescent lamp is up to 75 percent more efficient than standard incandescent bulbs. The two-pin G23 plug CFL shines at 230 lumens with a warm white color temperature of 2700K. Best when used for long operating times, this T4 lamp is great for applications like down lights, exit signs, wall sconces, or other surface mounted fixtures. Beyond saving money on utilities, this lamp is rated for 10,000 life hours meaning it will far outlast competing incandescent bulbs. This lamp is also RoHS compliant, making it more environmentally friendly than older fluorescent bulbs.