NAME ___________________________________________________________
CFL vs. Incandescent Cost Comparison: Part 2
“Why should I change my light bulbs to CFL’s?
dŚĂƚŝƐĂŐƌĞĂƚƋƵĞƐƟŽŶ͊ dŽŐĞƚƚŚĞĂŶƐǁ Ğƌ͕ ǁ Ğ
need to look at the life cycle cost for light bulbs.
Bulb
^ƉĞĐŝĮ ĐĂƟŽŶƐ
Incandescent
Compact
Fluorescent (CFL)
780 lumens
900 lumens
2,000 hours
12,000 hours
ϲϬǁ ĂƩ Ɛ
ϭϯ ǁ ĂƩ Ɛ
$.50
$2.00
6
1
$3.00
(circle 1)
$2.00
(circle 3)
$79.00
(circle 2)
$17.00
(circle 4)
Light Output (lumens)
Life Expectancy (hours)
What is the life cycle cost? The life cycle cost is
ƚŚĞŝŶŝƟĂůĐŽƐƚŽĨƚŚĞĂƉƉůŝĂŶĐĞ;ŝŶŽƵƌĐĂƐĞĂůŝŐŚƚ ŶĞƌŐLJh ƐĞĚ;ǁ ĂƩ ƐͿ
bulb) AND the cost of energy needed to use the
Cost per Bulb (dollars)
appliance over its life.
Number of Bulbs
/ŶŝƟĂůĐŽƐƚŽĨůŝŐŚƚďƵůďнŶĞƌŐLJĐŽƐƚƐ;ĞůĞĐƚƌŝĐŝƚLJͿ needed for 12,000
hours of light
= Life Cycle Cost of light bulb
Cost of Light Bulbs for
Use the chart at the right to complete the
12,000 hours of light
ĞƋƵĂƟŽŶƐďĞůŽǁ ƚŽĚĞƚĞƌŵŝŶĞǁ ŚŝĐŚůŝŐŚƚďƵůď
Cost of Electricity for
has the lowest life cycle cost and the greatest
12,000 hours of light
savings.
Use the table above to complete the chart.
Circle #1
+
Cost of Incandescent Bulbs
Circle #3
Cost of CFL Bulbs
Circle #2
=
Incandescent Life Cycle Cost
Cost of Electricity
+
Circle #4
Cost of Electricity
Amount from Square #1
Amount from Square #2
Incandescent Life Cycle Cost
CFL Life Cycle Cost
Square #1
=
=
Square #2
CFL Life Cycle Cost
Life Cycle Savings for
replacing one IL with a CFL
KEY CFL vs. Incandescent Cost Comparison
“Why should I change my light bulbs to CFL’s?
dŚĂƚŝƐĂŐƌĞĂƚƋƵĞƐƟŽŶ͊ dŽŐĞƚƚŚĞĂŶƐǁ Ğƌ͕ ǁ Ğ
need to look at the life cycle cost for light bulbs.
Bulb
^ƉĞĐŝĮ ĐĂƟŽŶƐ
Incandescent
Compact
Fluorescent (CFL)
780 lumens
900 lumens
2,000 hours
12,000 hours
ϲϬǁ ĂƩ Ɛ
ϭϯ ǁ ĂƩ Ɛ
$.50
$2.00
6
1
Cost of Light Bulbs for
12,000 hours of light
$3.00
(circle 1)
$2.00
(circle 3)
Cost of Electricity for
12,000 hours of light
$79.00
(circle 2)
$17.00
(circle 4)
Light Output (lumens)
Life Expectancy (hours)
What is the life cycle cost? The life cycle cost is
ƚŚĞŝŶŝƟĂůĐŽƐƚŽĨƚŚĞĂƉƉůŝĂŶĐĞ;ŝŶŽƵƌĐĂƐĞĂůŝŐŚƚ ŶĞƌŐLJh ƐĞĚ;ǁ ĂƩ ƐͿ
bulb) AND the cost of energy needed to use the
Cost per Bulb (dollars)
appliance over its life.
Number of Bulbs
/ŶŝƟĂůĐŽƐƚŽĨůŝŐŚƚďƵůďнŶĞƌŐLJĐŽƐƚƐ;ĞůĞĐƚƌŝĐŝƚLJͿ needed for 12,000
hours of light
= Life Cycle Cost of light bulb
Use the chart at the right to complete the
ĞƋƵĂƟŽŶƐďĞůŽǁ ƚŽĚĞƚĞƌŵŝŶĞǁ ŚŝĐŚůŝŐŚƚďƵůď
has the lowest life cycle cost and the greatest
savings.
Use the table above to complete the chart.
Circle #1
$3.00
Cost of Incandescent Bulbs
Circle #3
$2.00
Cost of CFL Bulbs
+
+
Circle #2
$79.00
Cost of Electricity
Circle #4
$17.00
Cost of Electricity
Amount from Square #1
Amount from Square #2
$82.00
$19.00
Incandescent Life Cycle Cost
CFL Life Cycle Cost
=
=
=
Square #1
$82.00
Incandescent Life Cycle Cost
Square #2
$19.00
CFL Life Cycle Cost
$63.00
Life Cycle Savings for
replacing one IL with a CFL