CaseHistoryDearborn

The retrofit job placed two, 4-ft., F32T-8 lamps end-to-end in the 8-ft. fixtures with mirror-type, polished aluminum reflectors and electronic ballasts. The 2-lamp, 8-ft. fixtures were fitted with four 4-ft., F32T-8 lamps and bright white reflectors. All the new lamps were rated at 24,000 hours. They used less electricity and provided high-color-rendering lighting quality.

In this case, the customer saved 122,218 watts and well over $56,000 in annual electrical costs on prevailing rates. Light levels measured at a standard 30 inches above the floor were double the original levels.

Business-case calculations showed this upgrade provided a 46.75% ROI and a payback from energy savings of 25.6 months. The job was covered by a 5-year warranty on labor and materials.



Large Grocery Warehouse
Before	After
		The retrofit job placed two, 4-ft., F32T-8 lamps end-to-end in the 8-ft. fixtures with mirror-type, polished aluminum reflectors and electronic ballasts. The 2-lamp, 8-ft. fixtures were fitted with four 4-ft., F32T-8 lamps and bright white reflectors. All the new lamps were rated at 24,000 hours. They used less electricity and provided high-color-rendering lighting quality. In this case, the customer saved 122,218 watts and well over $56,000 in annual electrical costs on prevailing rates. Light levels measured at a standard 30 inches above the floor were double the original levels. Business-case calculations showed this upgrade provided a 46.75% ROI and a payback from energy savings of 25.6 months. The job was covered by a 5-year warranty on labor and materials.
The original lighting system in this warehouse facility had 1,310 8-ft., single-lamp fixtures plus 374 8-ft., 2-lamp fixtures. These were standard aluminum fixtures with magnetic ballasts. The lamps in use were rated at 12,000-hours.
	Looking across the aisles (left), you can see the brighter retrofit area in the back. This upgrade doubled the light levels improving pallet label visibility and productivity. If this retrofit had been financed through one of the available energy funds, the customer could have received a 36-month program with a positive cash flow of $541.95 per month from the date of installation.
		The original components (on the right) included standard aluminum reflectors; T-12, cool white lamps; and a magnetic ballast. The retrofit components (on the left) included mirror-style reflectors, high-color-rendering, T-8 lamps; and efficient, energy-saving electronic ballasts.
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