The Illuminating Engineering Society of North America recommends the Life-Cycle Cost-Benefit Analysis method for comparing the overall cost of lighting systems.

This method illustrates the cost benefits of furniture mounted task ambient lighting as compared to a conventional two-component lighting system. To review the entire calculation and baseline assumptions, download the PDF file.

Total Floor Area: 41,055 SF Area of Installation: 18,596 SF No. of Workstations: 200 Size of workstations: 6' x 6' and 8' x 8' Annual Operating Hrs.: 2600 Years Projected: 15	Suspended Indirect w/Task Lights	Furniture Mounted Task Ambient
System Information
No. of Luminaires	354	200
No. of Ambient Luminaires	154	0
Lamp Type	F28T5	n/a
Wattage per Luminare	66	n/a
No. of Task Luminaires	200	200 task/ambient
Lamp Type	F28T5	F28T5 and F35T5
Wattage per Task Luminaire	33	40 (5'), 66 (8')
Initial Cost
Lighting System Installed Cost	$99,311 $5.35/sf	$97,012 $5.22/sf
Cost Impact on Cooling System	$8,582 $0.46/sf	$4,628 $0.25/sf
Installation Cost per Square Foot	$6.08	$5.76
Annual Energy and Maintenance Costs
	$9,053	$6,466
Final Comparisons
Present Worth	$158,841	$112,908
Annual Life-cycle Cost for years 1-7 Annual Life-cycle Cost for years 8-15	$22,577 $19,551	$14,600 $10,295