NEMA has published NEMA LSD 28-2014 Minimizing the Potential of Base Arcing Between Certain Wattage HID Lamps and Lampholders. Standard educates end users of high wattage HID lamps about lamp-bases and lampholders and recommends best practices for selection and maintenance. NEMA LSD 28-2014 may be downloaded at no cost on NEMA website.
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