You have just completed an audit of a local store with 3,000 square feet of conditioned floor space. You found out that the store hours are Monday through Friday (52 weeks a year, or a total of 260 days per year), from 9am to 6pm. You found that there are one hundred (100) T-12 fluorescent tube lamps (assume they use 48 watts each including ballast consumption) that are in use during store hours. Light levels throughout the store were measured and found to be appropriate. Refer to the Lighting Information table below for lighting power use and cost data.
|T-12 fluorescent tube w/ ballast||48 Watts each||$5.00 each|
|T-8 fluorescent tube w/ ballast||34 Watts each||$8.75 each|
Based on your audit:
Determine the lighting index for the store in
(48W*100)/(3,000 sq. ft.) = 1.6 W/sq. ft.
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