The Ultra Sun 901546 dual arc tube hybrid grow lamp offers the best of both worlds with a 600 watt high pressure sodium (HPS) and a 400 watt metal halide (MH) arc tube both inside one lamp jacket, operating simultaneously. This full spectrum lamp has a 3000K color temperature achieved by the dual arc tubes working together. This lamp is an excellent choice for full term growth, flowering, and fruiting. The dual arc tube lamp operates on a standard 1000 watt HPS magnetic ballast or an electronic ballast such as the Galaxy brand. Its 24,000-hour life is backed by 1-year warranty, so try it for yourself!