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  1. itsails

    Lighting a parking lot - W/sq.ft rule of thumb?

    I need to light a 200' x 400' parking lot with 150W HPS lamps on 30ft aluminum poles, .5 footcandels average maintained, .75 maintenance factor. 1. Is there a W/sq.ft number I could use to determine the approximate load? Want to find out if the existing distribution panel handel the...

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