Select what represents your scenario:

Existing incandescent light bulb 25 40 60 75 100 150 watts Replacement ENERGY STAR^® LED bulb 4 8 10 13 18 27 watts Number of light bulbs 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 bulbs Hours of use per day 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 hours

Cost per incandescent light bulb 0 1 2 3 4 5 6 7 8 9 10 . 00 25 50 75 dollars

Cost per ENERGY STAR^® LED bulb 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 . 00 25 50 75 dollars

Electricity cost/kWh (PUD avg. is 10.2) 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 . 0 1 2 3 4 5 6 7 8 9 cents

Your approximate savings, pay-off, and lifespan:

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Savings are for wattages shown. Your actual savings will vary based on the wattages you purchase. When comparing incandescent or halogen bulbs to ENERGY STAR qualified bulbs or fixtures, compare the light output, or lumens, and not Watts. Watts equal the energy used, not the amount of light.

Calculator provided courtesy of the sponsoring organizations of Northeast Energy Efficiency Partnerships, Inc. (NEEP).