(Pack of 6) F54T5/865/HO 54-Watt T5 Fluorescent High Output Bulbs, 6500K Daylight, 54W 48 inch Fluorescent Light Bulbs SPECS  High Output (HO) 54Watt T5 Bulb 4 Foot Bulb, Miniature Bi-Pin (G5) Base, 48 (actual size including prongs 45.2") Fluorescent Tube TOP QUALITY GUARANTEE - Made from high quality materials and built to last for up to 20,000 hours, we strive to provide top quality products to our customers ROOM ENHANCER  6500K High Output (grow) Daylight Lights will instantly impact the lighting of any Home Garage Gymnasiums, Warehouses, Shops, Office or any Plant Growing Applications BRIGHTNESS - Designed to deliver performance with 4,800 High Lumen output, CRI 85 and Full Spectrum HAPPY CUSTOMERS - At Wales we put our customers FIRST! We truly believe that the happiness of our customers is the reason for a successful business. If for whatever reason you're dissatisfied with your order, simply contact us and we'll do whatever we can to make things right. All of our bulbs come with a 100% Satisfaction Guarantee!