Choosing the right lighting for your home or business is more than just comparing the price tag. A true evaluation requires a life-cycle cost analysis, which considers the initial purchase, energy consumption, and replacement expenses over time. This article compares three common technologies: incandescent, compact fluorescent (CFL), and light-emitting diode (LED) bulbs.

The initial cost of an incandescent bulb is low, often under one dollar. However, its lifespan is only about 1,000 hours. For a home requiring 15 bulbs burning 5 hours daily, you would replace each incandescent bulb about every 7 months. Over a 10-year period, that means roughly 17 replacements per socket. The energy cost is also high; a 60-watt incandescent consumes 60 kWh per 1,000 hours of use.

CFLs offer improvement. They cost around two to three dollars initially, last about 8,000 to 10,000 hours, and use about 75% less energy than incandescents. Over the same 10-year period, only two replacements per socket are needed. The life-cycle savings come primarily from reduced electricity bills.

LEDs are the clear winner in life-cycle cost. Though the initial price is higher (five to ten dollars), they last 25,000 to 50,000 hours. Assuming 5 hours daily use, a single LED bulb can function for over 13 years. They use 80-90% less energy than incandescent, consuming only 9-12 watts for equivalent brightness.

To calculate total cost of ownership over 10 years for one bulb (using $0.12/kWh electricity): Incandescent equals about $72 (bulbs + energy). CFL equals about $30. LED equals about $18. Despite the higher upfront cost, LEDs save over 70% of total operating expenses. Additionally, LEDs generate less heat, reducing cooling load in summer, and contain no mercury, simplifying disposal. In summary, for long-term financial and environmental efficiency, LED technology is the superior investment.