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High Pressure Sodium - Medium Base light bulbs have a standard base like a regular household bulb. Please note that the bulb wattage must match the wattage rated by the fixture or ballast. Wattages are not interchangeable.
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High Pressure Sodium Mogul Base light bulbs have a screw in base that is one size larger than a regular household bulb. Please note that the bulb wattage must match the wattage rated by the fixture or ballast. Wattages are not interchangeable.
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