Digilux Metal Halide and High Pressure Sodium bulbs are favored by growers because of their wide color spectrum, efficiency, and extreme lumen output. They are engineered for use with all digital ballasts and feature enhanced spectrums, longer bulb life, and less lumen depreciation. Digilux high quality arc tubes are built to withstand the rigorous performance requirements that digital ballasts demand. Digilux bulbs are made to the highest industry standards, are universal, and can be used in both vertical and horizontal fixtures. They offer superior performance compared to all other MH and HPS bulbs and are finely tuned for maximum PAR light production, giving your plants the light they deserve. Digilux Metal Halide bulbs deliver 25% more energy in the red and orange spectrums. The HPS bulbs deliver 25% more energy in the blue and violet spectrums. They come with a 1 year warranty.