Dysmio Lighting - 54-Watt T5 High Output Daylight 5000K Linear Fluorescent Alto Light Bulb [40 Pack] Case of 40 4800 Lumens Estimated life of 23.1 years based on 3 hours use per day (35000 hours) T-5 bulb with a Miniature Bipin base 4 Foot T5 Bulbs