Sunmaster� Full Nova Metal Halide Lamp is the best all-in-one lamp: the most objective measurement of total light energy available for photosynthesis. Optimized for use on electronic ballasts. Sunmaster� Full Nova 6,000� K Lamps set new standards in general plant lighting, promoting high levels of photosynthesis without compromise. Pulse start lamp designed for electronic or pulse start ballasts only. These are balanced, full spectrum lamps that are the closest to the sunlight.