600W 400V HPS pulse-start bulb designed to be used with the Kumatek Ultimate Pro 600W 400V electronic ballast. It is made with high-grade ceramic arc tube technology and a horticultural-specific gas blend that creates optimal spectral output for healthy plant growth.

400V HPS bulbs are more efficient than standard HPS bulbs, allowing for a 10% increase in light intensity and PAR/PPF output.

The ceramic arc tube allows the lamp to operate at higher internal temperatures, increasing color rendering, production, and efficiency. The ceramic arc tube resists interaction with chemicals inside the tube, stabilizing the chemical mixture over the life of the lamp, thereby improving color consistency and maintaining PAR/PPF levels.