With a beam angle of more than 220°, T8 4ft LED glass tubes are good for lighting large areas with a total brightness of 1710 lumens. An 18 watt of glass tube can replace 50 watts of metal halide. These lights do not release any heat due to great heat sinking made out of aluminum. If one goes for the ballast bypass option of LED installation, even more money can be saved in maintenance costs along with 70% savings on the electricity bills. These lights replace 50 watts of metal halide which means it is even 200% more energy-efficient than metal halides