Increase Text SizeDecrease Text SizePrint this page

 

 
Screening Tool for Indirect Lighting

Go back to the Purchasing Advisor on indirect lighting.

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.