These DLC approved T8 4ft LED Glass Tubes are rebate eligible and render a total lumen output of 1710 lumens. Every 18 watts of the tube can replace 50 watts of metal halide, as there is almost no heat wastage, thanks to the robust aluminum heat sink. The total beam angles of these lights are 220 degrees, which is considerably wide along with the total lumen output of 1710 lumens. The CRI of these lights is more than 80 to render a natural illumination like that by natural light. These lights are IP20 rated and come with a warranty of 3 years.