OttLIte T13330 13W OttLite Replacement Bulb, Type A •Superior image and color rendering •Low heat, low glare illumination helps reduce eyestrain •Energy efficient bulb rated to last up to 10,000 hours •Lasts longer than conventional bulbs and saves more energy •For use only as a replacement bulb with specific OttLite lamps - bulb type A Need more information on this product? Click here to ask. Dimensions: 8.2″ x 6.2″ x 0.87″.