[] The ratio of the lumens of a high intensity discharge (HID) lamp-ballast-luminaire combination in a given operating position to the lumens of the lamp-luminaire combination a) operated in the position for rating lamp lumens; and b) using the standard (reference) ballasting specified for rating lamp lumens.

Note: If the given lamp operating position is not the same as the lamp rating position, the lumens ratio for the operating ballast to the standard rating ballast is determined in the given operating position.This ratio is multiplied by the lamp position factor to obtain the equipment operating factor.

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