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Ceramic Metal Halide Questions

17 years ago

I am interested in buying a ceramic metal halide lamp. I am confused about the vertical versus horizontal. I currently have an HPS lamp with the reflector hanging from the ceiling with the bulb parallel to the ceiling/floor. Is this vertical or horizontal? Also, my ballast is a 400 watt magnetic HPS. Do I need anything else to use the Philips HPS CMH bulb? Thanks in advance.

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