Science, Technology, Economics, and Public Thoughts and Policy: An Analysis of Lighting in the Academic Complex Lounge at Bethel University, Saint Paul, MN
March 17, 2000

Dr. Bob Kistler
ENS305K Transforming Technology: Environmental Perspectives


 Evaluated Component

 90 Watt Incandescent Bulb from AC Lounge

25 Watt Compact Flourescent "Transformed" light bulb technology

  •  Light Output

 

 

  •  Energy use
  • Heat output (inefficiency)
  • Cost 

 

 Evaluated Component

 90 Watt Incandescent Bulb from AC Lounge

25 Watt Compact Flourescent "Transformed" light bulb technology

 WATTS
 77.88
 24.14
 KWH/year
 682.2
 211.4
 Cost / KWH

 $0.0305 (Commercial Rate)

(MN Residential = $0.0638)

 $0.0305
 Bethel Annual Electricity Cost
 $20.81
 $6.45
 bulb cost
 $1.00
$14.00
 #bulbs/year
 8.76
 0.876
 bulb cost/year
 $8.76
 $12.26
 labor cost (5 minutes/bulb)
 $4.20
 $0.42
 Total Cost per year per bulb
 $33.77
 $19.13
 Total Cost per year/10 lamps in AC lounge
 $337.65
 $191.33

©Robert Kistler 2000
Last updated 11/22/06