Many electronic ballasts operate on a sine wave at high frequencies (120,000 Hertz). The square wave ballast inside of the ARC Commercial CMH 315W operates at a much lower frequency (50/60 Hz). The low frequency operation is easier on the internal electrical components, which leads to increased longevity of the entire unit. The low frequency operation also helps avoid harmonic distortion that could potentially cause a color shift in the light system’s spectral output. Put another way, lighting systems that operate on square wave technology are more consistent in spectral output and are much less likely to have any “shifts” in the spectrum during the life span of the bulb. Another advantage of the low frequency operation is that it will not cause any issues related to radio frequency (RF) interference. This is a common problem with ballasts that operate on high frequencies. The ARC Commercial CMH 315W lighting system is just another example of how Hydrofarm continues to provide horticulturists with the very best equipment for growing plants indoors. Proudly designed and assembled in Petaluma, California, the ARC Commercial CMH 315W lighting system is the perfect solution for serious indoor horticultural hobbyists and/ or commercial indoor growers. A true combination of innovative technologies come together in the ARC Commercial CMH 315W to form the ultimate complete lighting system package (the hanging hardware is even included). The impressive balanced spectrum, high CRI rating, and UV light produced by the ARC Commercial CMH 315W lighting system is sure to supply indoor crops with everything they need to fl ourish. From the trusted Philips brand ballasts and lamps to the 95% refl ective aluminum refl ector, this lighting package has everything an indoor grower needs to provide his or her garden with a harmonious blend of effi ciency and effectiveness. GG For more information call 800.637.9990 or visit