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from Okho in Shawano, WI:
#765
With street lighting, how do I calculate the approximate watts the ballast uses in High Pressure Sodium fixtures?
It’s a little complicated. Read on for the details.
A variety of factors including identification of the wattage, type of lamp, and type of ballast must be known in order to calculate the approximate watts a ballast uses in High Pressure Sodium fixtures. The Philips Web site might help you in gathering relevant details needed to answer your question in more detail. Furthermore, the article “What Is Luminaire Efficiency?” offers equations to help you calculate your answer. Need further assistance? If you would like to start working with an energy advisor through Focus on Energy, contact us at 800.762.7077.