Designed for use with Lumatek Digital Ballasts, these Lumatek High-Par Output HPS Lamps are designed by the world"s leading HID lamp engineers. Engineered and manufactured with precision, they provide exceptional performance on both magnetic and electronic ballasts. Lumatek High-Par Output Lamps deliver an optimized spectrum and high level of photosynthetic active radiation to promote healthy plant growth. They have strengthened seals and a reinforced arc frame to ensure long lasting performance with stable lumen output. Available in 400-, 600-, and 1000-watt varieties.