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Sustainable Lighting


    Efficient lighting is needed for sustainable architecture. In 2009, US Department of Energy testing results on LED lamps showed an average efficacy of 35 lm/W, below that of typical CFLs, and as low as 9 lm/W, worse than standard incandescent bulbs. A typical 13-watt LED lamp emitted 450 to 650 lumens,[175] which is equivalent to a standard 40-watt incandescent bulb.

    However, as of 2011, there are LED bulbs available as efficient as 150 lm/W and even inexpensive low-end models typically exceed 50 lm/W, so that a 6-watt LED could achieve the same results as a standard 40-watt incandescent bulb. The latter has an expected lifespan of 1,000 hours, whereas an LED can continue to operate with reduced efficiency for more than 50,000 hours.

    See the chart below for a comparison of common light types:

Lightbulb Projected Lifespan50,000 hours10,000 hours1,200 hours
Watts Per Bulb (equiv. 60 watts)101460
Cost Per Bulb$2.00$7.00$1.25
KWh of Electricity Used Over 50,000 Hours5007003000
Cost of Electricity (@ 0.10 per KWh)$50$70$300
Bulbs Needed for 50,000 Hours of Use1542
Equivalent 50,000 Hours Bulb Expense$2.00$35.00$52.50
TOTAL Cost for 50,000 Hours$52.00$105.00$352.50

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