Osram Plantastar lamps have been specifically designed for horticultural use and has the highest PAR rating (PAR is the amount of usable light available to the plant) of any bulb on the market.
The Osram Plantastar 600W also produces 30% more blue light than a standard HPS bulb. Both 400w and 600w Plantastar bulbs are available.
Please note that this bulb is designed for 400V fixtures & should not be connected to 240V systems.