Osram PlantStar 600W 400V
Osram Plantastar 600w 400v hps bulb has the highest PAR rating (meaning it has the highest plant-usable light output) of any bulb on the market, in addition to having 30% more blue spectrum than a standard HPS bulb.
Most sodium lamps you use in indoor gardening are not specifically designed for growing plants but the Osram Plantastar is, featuring many benefits over the competition.