Sylvania 71265 Ultra LED 20-watt 48-Inch T8 Lamp with 4100K Color Temperature and Case of 4 Lamps 1650 Initial Lumens at 83 Lumens Per Watt 20 Watts of energy used with a long 50,000 hour life Direct line voltage driven and no ballast is required with a universal input voltage of 120-277V No warm-up time and instant-on to full brightness Impact resistant and mercury free with no harmful UV or IR emission