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							Change a Light…


 CHANGE THE
   WORLD!
 Energyis measured in kilowatt
 hours (kWh)

 and   is determined by
        Power (Watts) x Time
                1000
One Light Bulb Per Student, One Hour
 One “regular” light bulb (60 watt)
 For every one student (95)         for
  one hour:
            60 W x 95 hours
                  1000

             5,700/1000 =
                5.7 kWh
From the Department of Energy and
Environmental Protection Agency:
Pounds of Carbon Dioxide produced
by electricity source

 1 kWh coal=2.123 pounds of CO2
 1 kWh petroleum=1.943 pounds of CO2
 1 kWh natural gas=1.255 pounds of
 CO2
 U. S. Average=1.35 pounds of CO2
One Light Bulb Per Student, One HOUR

 60   Watt bulb:
         CO2 produced:

          5.7 x 1.35=
       7.7 pounds of CO2
One Light Bulb Per Student, One HOUR
   One CFL light bulb (13 watt)
   For every one student (95) for one hour:
              13 W x 95 hours
                   1000

                 1235/1000=
                   1.2 kWh
One Light Bulb Per Student, One HOUR

 13   Watt CFL bulb:
         CO2 produced:

            1.2 x 1.35=
         1.6 pounds of CO2
One Light Bulb Per Student, One HOUR

  Savings in Carbon Dioxide:

        7.7 lb - 1.6 lb =
       6.1 pounds of CO2
One Light Bulb Per Student, One DAY
 One regular light bulb (60 watt)
 For every one student (95)       for
  four hours (per day):
           60 W x 380 hours
                  1000

            = 22800/1000
              22.8 kWh
One Light Bulb Per Student, One DAY

 60   Watt bulb:
         CO2 produced:

          22.8 x 1.35 =
       30.8 pounds of CO2
One Light Bulb Per Student, One DAY
 One CFL light bulb (13 watt)
 For every one student (95)     for
  four hours (per day):
           13 W x 380 hours
                 1000

             = 4940/1000
               4.9 kWh
One Light Bulb Per Student, One DAY

 13   Watt bulb:
         CO2 produced:

          4.9 x 1.35=
       6.6 pounds of CO2
One Light Bulb Per Student, One DAY

Savings in Carbon Dioxide:

       30.8 lb – 6.6 lb =
      24.2 pounds of CO2
One Light Bulb Per Student, One YEAR

 One regular light bulb (60 watt)
 For every one student (95) for
  four hours (per day) for 365 days:
    380 (one day) x 365 = 138700

         60 W x 138700/1000
             =8322 kWh
One Light Bulb Per Student, One YEAR

 60   Watt bulb:
         CO2 produced:

      8322 x 1.35=
 11,234.7 pounds of CO2
One Light Bulb Per Student, One YEAR

 One CFL bulb (13 watt)
 For every one student (95) for
  four hours (per day) for 365 days:
    380 (one day) x 365 = 138700

         13 W x 138700/1000
            =1803.1 kWh
One Light Bulb Per Student, One YEAR

 13   Watt bulb:
         CO2 produced:

      1803.1 x 1.35=
  2,434.2 pounds of CO2
One Light Bulb Per Student, One YEAR

 Savings in Carbon Dioxide:

    11234.7 lb – 2434.2 lb=
           8,800.5
    pounds of CO2 per year
One Light Bulb Per Student, One YEAR

 60   Watt regular bulb:
       Cost of Energy used

   8322 kWh x 10 c/kWh
  = 83220 cents ($832.20)
One Light Bulb Per Student, One YEAR

 13   Watt CFL bulb:
       Cost of Energy used

  1803.1 kWh x 10 c/kWh
  = 18031 cents ($180.31)
One Light Bulb Per Student, One YEAR

     Savings in dollars:

       $832.20-$180.31
          = $651.89
One Light Bulb Per Student, One YEAR

$651.89 divided by 95 students
      = $6.82 per student

How much did that 15 watt bulb
           cost?...
    And just so you know…
          60 W = $1.72
   Replaced every 1,500 hours
          13 W = $4.99
   Replaced every 8,000 hours
        (5.3 times longer)
       $1.72 x 5.3= $9.23
Now which one is more expensive?