HPS Core & Coil ballasts were designed to only operate HPS lamps, Metal Halide Core & Coil ballasts were designed to only operate Metal Halide lamps. Conversion lamps give you the ability to operate a HPS lamp on a Metal Halide ballast or Metal Halide lamp on a HPS ballast. EYE HORTILUX provides conversion lamps for both Core & Coil ballast types.
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