Powerplant Super HPS Grow Bulb available in; 250watt, 400watt, & 600watt HPS bulbs are the most common hid to use, especially during flowering, giving off characteristic reddish light. The red in the light spectrum encourages good flower/ fruit growth. It is possible to use hps during vegetative growth, but only for a week or two. Older plants start to look a little unnatural and ‘lanky’, with large internodal length and brittle stems. For this reason conversion bulbs, or enhanced spectrum bulbs are needed, or even better, a metal halide. HPS bulbs can be re-started after about 3 minutes if powered down. Power plant HPS high pressure sodium – 1000watt Powerplant high pressure sodium lamps promote optimum vegetative growth and flowering. Provides a richer more nutritious light available output; 250watt, 400watt, 600watt & 1000watt.