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FOOTNOTES:
* Not available in IOPA models.
1) 4380 based on operating the lamps 12 hours per day/7 days a week.
2) 8760 based on operating the lamps 24 hours per day/7 days a week.
3) Ballast Factor (BF):Measure of light output from lamp operated by commercial ballast,as compared to a laboratory standard reference ballast.
4) Approximate initial lumens.The lamp lumen output is based upon lamp performance after 100 hours of operating life,when the output is measured during operation
on a reference ballast under standard laboratory conditions.
5) For expected lamp lumen output,commercial ballast manufacturers can advise the appropriate ballast factor for each of their ballasts when they are informed of the
designated lamp. The ballast factor is a multiplier applied to the designated lamp lumen output.
6) Maintained lumens =Approx.initial lumens x ballast factor x lumen maintenance x number of lamps.
7) Based on watts saved per lamp x annual operating hours (4380) x kWh rate ($0.10) / 1000 / 3.Kilowatt hour rate may vary depending on location and energy company.
8) Based on watts saved per lamp x ratedaverage life (36,000 hrs) x kWh rate ($0.10) / 1000 / 3.Kilowatt hour rate may vary depending on location and energy company.
9)Average life under engineering data with lamps turned off and restarted once every 12 operating hours.
10) Approximate initial lumens.The lamp lumen output is based upon lamp performance after 100 hours of operating life,when the output is measured during operation on
a reference ballast under standard laboratory conditions.For expected lamp lumen output,commercial ballast manufacturers can advise the appropriate ballast factor for
each of their ballasts when they are informed of the designated lamp.The ballast factor is a multiplier applied to the designated lamplumen output.
11) Design lumens are the approximate lamp lumen output at 40% of the lamp’s rated average life.This output is based upon measurements obtained during lamp operation
on a reference ballast under standard laboratory conditions.
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