2. Calculate the energy efficiencies of four types of bulbs in the figure below. Only calculate bulbs with 450 lumens. Lighting-ideas.net Bulb Type Bright Brightest 450 Lumens 800 Lumens 1100 Lumens 1600 Lumens Rated Life Least Efficient Incandescent Energy used 40W $4.82/yr 60w $7.23/yr 75w $9.03/yr 100w $12.05/yr 1 Year Halogen Energy used 29w $3.49/yr 43w $5.18/yr 53w $6.38/yr 72w $8.67/yr 1-3 Years CFL Energy used 11w $1.32/yr 13w $1.57/yr 20w $2.41/yr 23w $2.77/yr 6-10 Years Most Efficient LED Energy used 9w $1.08/yr 12w $1.44/yr 17w $2.05/yr 20w $2.41/yr 15-20 Years

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