Phantom II CMH 315w Ceramic Metal Halide Digital BallastThe phantom CMH is low frequency ballast designed specifically for 315W high intensity ceramic halide lamps to boost vegetative and flowering growth. The ballast works silently, and it is highly energy efficient, which provides greater stability and promises consistent output levels. The multi aspect protection circuitry feature protects against lamp failure, lighting, hot lamp startups, under voltage, and overvoltage. Low Frequency Amount: It gives