HIGH PRESSURE SODIUM LAMPS - These lamps are red/orange in the spectrum. They are the best lamps available for secondary or supplementary lighting (used in conjunction with natural sunlight). This type of light promotes flowering / budding in plants. It is ideal for Greenhouses / Commercial growing applications.

400 Watt HPS Standard lamps are rated at 50,000 lumens.

Select from 3 different brands: Osram/Sylvania, Philips or GE