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Education Building Arizona, USA

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6 High Pressure Sodium 150W each, 16,000 Lumens 12 hours per day

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6 Mercury Vapor 160W each, 2,550 lumens 12 hours per day

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22 Compact Fluorescents 13W each, 810 lumens 12 hours per day

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What you need to know for the calculations For all lamps: Cost of electricity per kilowatt-hour $0.12 150 6 6 4,380 Number of Bulbs: Bulb Wattage: Hours bulb is on in one year: 1) High Pressure Sodium Bulb Lumens: 16,000 13 22 4,380 Number of Bulbs: Bulb Wattage: Hours bulb is on in one year: 3) Compact Fluorescent Bulb Lumens: 810 160 6 6 4,380 Number of Bulbs: Bulb Wattage: Hours bulb is on in one year: 2) Mercury Vapor Bulb Lumens: 2,250

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Lumens of Bulb Type 1 Wattage of Bulb Type 1 Efficacy of Bulb Type 1 ÷ = Efficacy High Pressure Sodium 16,0000 150 107

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Number of Bulbs of Type 1 Estimated Hours per Year Estimated Hours Used from All Bulbs of Type 1 × = Wattage of Bulbs Energy Used in a Year by All Bulbs of Type 1 × = 6 150 W 4,380 hrs 26,280 hrs 3,942,000W-hrs Energy Used High Pressure Sodium

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Lumens of Bulb Type 2 Wattage of Bulb Type 2 Efficacy of Bulb Type 2 ÷ = Efficacy Mercury Vapor 2,55016016

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Number of Bulbs of Type 2 Estimated Hours per Year Estimated Hours Used from All Bulbs of Type 2 × = Wattage of Bulbs Energy Used in a Year by All Bulbs of Type 2 × = 6 160 W 4,380 hrs 26,280 hrs 4,204,800W-hrs Energy Used Mercury Vapor

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Lumens of Bulb Type 3 Wattage of Bulb Type 3 Efficacy of Bulb Type 3 ÷ = Efficacy Compact Fluorescent 81013 62

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Number of Bulbs of Type 3 Estimated Hours per Year Estimated Hours Used from All Bulbs of Type 3 × = Wattage of Bulbs Energy Used in a Year by All Bulbs of Type 3 × = 22 13 W 4,380 hrs 96,360 hrs 1,252,680W-hrs Energy Used Compact Fluorescent

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Kilowatt-hours Used in a Year Cost per Kilowatt-hour Amount Spent on Outdoor Lighting per Year Amount of Greenhouse Gas Produced While Powering Outdoor Lighting Each Year Kilowatt-hours Used in a Year Energy Used in a Year by All Bulbs of Type 1 3,942,000W-hrs 1000 3,942 kW-hrs $0.12 × × 0.84 = kg kWh = ÷ = $473.04 3,311 kg Energy, Cost, and Carbon Footprint High Pressure Sodium

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Kilowatt-hours Used in a Year Cost per Kilowatt-hour Kilowatt-hours Used in a Year Energy used in a Year by All Bulbs of Type 1 3,942,000W-hrs 1000 3,942 kW-hrs $0.12 × × 0.84 = kg kWh = ÷ = $473.04 3,311 kg Energy, Cost, and Carbon Footprint High Pressure Sodium Amount of Greenhouse Gas Produced While Powering Outdoor Lighting Each Year Amount Spent on Outdoor Lighting per Year

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Kilowatt-hours Used in a Year Cost per Kilowatt-hour Amount Spent on Outdoor Lighting per Year Kilowatt-hours Used in a Year Energy used in a Year by All Bulbs of Type 2 4,204,800W-hrs 1000 4,205 kW-hrs $0.12 × × 0.84 = kg kWh = ÷ = $504.58 3,532 kg Energy, Cost, and Carbon Footprint Mercury Vapor Amount of Greenhouse Gas Produced While Powering Outdoor Lighting Each Year

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Kilowatt-hours Used in a Year Cost per Kilowatt-hour Amount Spent on Outdoor Lighting per Year Kilowatt-hours Used in a Year Energy Used in a Year by All Bulbs of Type 2 4,204,800W-hrs 1000 4,205 kW-hrs $0.12 × × 0.84 = kg kWh = ÷ = $504.58 3,532 kg Energy, Cost, and Carbon Footprint Mercury Vapor Amount of Greenhouse Gas Produced While Powering Outdoor Lighting Each Year

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Kilowatt-hours Used in a Year Cost per Kilowatt-hour Amount Spent on Outdoor Lighting per Year Amount of Greenhouse Gas Produced While Powering Outdoor Lighting Each Year Kilowatt-hours Used in a Year Energy Used in a Year by All Bulbs of Type 3 1,252,680W-hrs 1000 1,253 kW-hrs $0.12 × × 0.84 = kg kWh = ÷ = $150.32 1,053 kg Energy, Cost, and Carbon Footprint Compact Fluorescent

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Kilowatt-hours Used in a Year Cost per Kilowatt-hour Kilowatt-hours Used in a Year Energy used in a year by all bulbs of Type 3 1,252,680W-hrs 1000 1,253 kW-hrs $0.12 × × 0.84 = kg kWh = ÷ = $150.32 1,053 kg Energy, Cost, and Carbon Footprint Compact Fluorescent Amount of Greenhouse Gas Produced While Powering Outdoor Lighting Each Year Amount Spent on Outdoor Lighting per Year

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Results Energy used in one year: Amount spent on lighting: Greenhouse gas produced in one year: 2) Mercury Vapor 4,205 kW-hrs $504.58 3,532 kg 16 Efficacy: Energy used in one year: Amount spent on lighting: Greenhouse gas produced in one year: 1) High Pressure Sodium 3,942 kW-hrs $473.04 3,311 kg 107 Efficacy: Energy used in one year: Amount spent on lighting: Greenhouse gas produced in one year: 3) Compact Fluorescent 1,253 kW-hrs $150.32 1,053 kg 62 Efficacy:

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+ 1) High Pressure Sodium 2) Mercury Vapor 3) Compact Fluorescent Grand total: kWh Greenhouse Gases Cost of lighting 3,942 kW-hrs$473.04 3,311 kg 4,205 kW-hrs $504.58 3,532 kg 1,253 kW-hrs $150.32 1,053 kg 9,400 kW-hrs$1,127.947,896 kg The Total Energy, Cost & Carbon Footprint

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+ 1) High Pressure Sodium 2) Mercury Vapor 3) Compact Fluorescent Grand total: kWh Greenhouse Gases Cost of lighting 3,942 kW-hrs$473.04 3,311 kg 4,205 kW-hrs $504.58 3,532 kg 1,253 kW-hrs $150.32 1,053 kg 9,400 kW-hrs$1,127.947,896 kg The Total Energy, Cost & Carbon Footprint

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