People can differentiate fine contrasts better and quicker with Metal Halide lighting than they can with HPS. Nighttime vision is important because that’s when most accidents occur. At least 6 times as much yellow high pressure sodium light is needed to produce the same effect on driver reaction times as white metal halide light. 150 watt Venture Pulse Start Metal Halide 50% has longer life, and saves 25 watts with more light than standard 175 watt metal halide. Higher CRI of 65-70 over HPS lamps at 22 CRI.