5. Life-Cycle Economic Cost of Lightbulbs

When you need lightbulbs, you face a choice between bulbs that produce the same amount of lumens. Which of the following light bulb you would choose and why? (Electricity rate: $0.11/kWh; Time frame of analysis: 10,000hrs)

Bulb1

Type: Incandescent Lightbulbs 60W

Cost: $0.40/bulb

Life: 1000 hr

Bulb 2

Type: Compact Fluorescent Lamp 15W

Cost: $1.50/bulb

Life: 7000 hr