NEW - SYLVANIA BULB 600W 400V HPS-GROWLUX FOR GROWTH AND BLOOMThis bulb can be used for growth and bloom. The color light is mostly red yellow spectrum, needed for the flowering stage but it also has 30% more of the blue spectrum (for the vegetative stage). Gro Lux High Pressure Sodium 600W 400V grow lamp, patented arc tube delivers the highest photosynthetic efficiecy, performance maintained at an exceptional level due to improved structure of the outer bulb. Works only with ballast 600W 400V HPS ballast and E