25-Pack 2ft Lights Talk Super T8 LED Light Tube, 9W(17W or Higher Equivalent), 1150lm, 4000K(Cool White), AC/120~277V, Single-Ended Power, Frosted, Glass, UL-Listed & DLC-Listed (25, 4000K) 5 Year warranty. 50,000 HoursLife span, more than 27 years (Based on 5Hrs/day average). Save more than 50% on your electricity bill! Outstanding new generation GLASS tube design, Wide beam angle-220 Degree, Higher efficiency -Up to 150lm/W, Longer lifetime-up to 100,000 Hours. Manufacturer direct sales! Super, the manufacturer of Lights Talk is the partner of the top lighting brands in USA. It is widely installed by offices, hospitals, supermarkets, schools and hotels national wide UL & DLC listed. All 4FT and 2FT tubes are DLC-listed and thus eligible for State and Nationwide rebate programs. For your safety the products are UL-listed to avoid electrical risk Warning! Ballast bypass required. Please use un-shunted or non-shunted tombstones (also known as lamp holders) to apply power to one end of tubes only!