Yield Lab Professional Series 120/220v 630w Dual Bulb CMH Open Wing Reflector/BallastBulbs not included. When Yield Lab decided to create the Yield Lab Professional Series 120 220v 630w Dual Bulb CMH Open Wing Complete Grow Light Kit they made sure to produce a light that will give you plants a wide coverage area without sacrificing intensity. Whether youre growing with hydro or in soil, this grow light carries a spectrum that will give you a more balanced white light compared to an MH bulb that gives you an extremely intense blue