Mechanical HQI Ballast Metal halide ballast, 35W VK/HQI/35 Metal halide ballast, 70W VK/HQI/70 Metal halide ballast, 100W VK/HQI/100 Metal halide ballast, 150W VK/HQI/150 Metal halide ballast, 250W VK/HQI/250 Metal halide ballast, 400W VK/HQI/400 Metal halide ballast, 1000W VK/HQI/1000