OTT-LITE VisionSaver 4-Pin 18 Watt Plug-In Swirl Bulb Set of 1 For use only as a replacement bulb with specific OttLite lamps Energy efficient bulb rated to last up to 10,000 hours 8 in. L x 3 in. W x 10 in. H (1 lbs.) 18W replacement bulb delivers the right mix of brightness and contrast to bring true colors and comfortable clarity to your world so you can enjoy your time even more. You'll see colors accurately so you can make selections with total confidence. And, you'll see fine print and details with ease under this unique low heat, low glare illumination that helps reduce eyestrain. Low heat, low glare illumination helps reduce eyestrain