Digilux enhanced Blue spectrum HPS bulbs are engineered to work on electronic digital ballasts. Digilux HPS bulbs are not recommended for use on magnetic ballasts. Digilux universal bulbs are hot start approved and can be used in both vertical and horizontal fixtures. Digilux HPS bulbs deliver 25% more energy in the Blue spectrum for use in greenhouses and grow rooms. Available in 400, 600, and 1000 wattages with higher lumen output than Hortilux bulbs.