Sylvania 71254 Ultra LED 10-watt 24-Inch T8 Lamp with 3000K Color Temperature and Case of 4 Lamps 850 Initial Lumens at 85 Lumens Per Watt 10 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