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Screening Tool for Indirect Lighting

 
Direct lighting
Indirect lighting alternative 1
Indirect lighting alternative 2
Lamp typea
Number of lamps/fixture
Number of fixtures
NA
NA
Total length (feet)
NA
Cost/fixture (US$)
NA
NA
Cost/foot (US$)
NA
Lamp cost (US$)
Labor rate (US$/hr)
Installation time (hours)
Lamp power (watts)
Lamp life (hours)
 
Number of lamps
Total equipment cost (US$)
Installation cost (labor) (US$)
Total installed cost (US$)
Total lighting power (watts)
Annual lighting energy use (kWh)b
Annual lighting energy cost (US$)c
Annual cooling energy (kWh)d
Annual cooling energy cost (US$)
Annual relamping cost (US$/yr)
Annual operating cost (US$/yr)
Installed cost premium (US$)
NA
Annual operating cost savings (US$)e
NA
Simple payback (yr)
NA

Notes:
a. Data in this row is descriptive only and will not effect calculations.
b. Assuming 4,000 operating hours/yr.
c. Assuming $0.08/kWh.
d. Assuming 80% of input power becomes a cooling load, and cooling coefficient of performance = 3.4.
e. Ignore payback calculation if annual operating cost savings are less than zero.
kWh = kilowatt-hour; NA = Not applicable.