Ushio US5001675 Conversion Lamp, 600-watt, Opti Blue
These bulbs come in 400W, 600W, 1000W SUPER high output MH with maximized output in both blue and red spectral range. SUPER MH bulb with maximum output in both blue and red spectrum. They outperform standard MH bulbs. They are the conversion bulb to operate on ANSI coded HPS ballast. They are optimized for maximized branching and vegetative growth and added red spectrum for flowering efficiency.