Instead of using traditional incandescent light bulbs we may install
fluorescent lights or natural skylights which reduces the amount of energy required to attain the same level of illumination.

Compact fluorescent lights may last from 6 to 10 times longer.
Energy efficiency and renewable energy are the twin pillars of sustainable energy policy.
In many countries energy efficiency can be used to reduce the level of energy imports from foreign countries and may slow down the rate at which domestic energy resources are depleted, thus having a national security benefits.

There are many motivations to improve energy efficiency.
Reducing energy use reduces energy costs and may result in a financial cost saving to consumers. Reducing energy use is also a solution to the problem of reducing carbon dioxide emissions.

Researches show that improved energy efficiency in buildings, industrial processes and transportation could reduce the world's energy needs in 2050 by one third, and help control global emissions of greenhouse gases.