How many does it take to change a light bulb?
Five: Three to design a nuclear-powered light bulb that never needs changing, one to install it, and one to write the computer program that controls the wall switch.
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Five: Three to design a nuclear-powered light bulb that never needs changing, one to install it, and one to write the computer program that controls the wall switch.
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Solar Lights for Outdoor Illumination
Let the sun work for you! Consider solar lights for outdoor lighting. Solar cells convert sunlight into electricity that can be stored in a battery and tapped at night to make light. Check manufacturers’ instructions to make sure your solar lights are situated to receive sufficient sunlight to recharge during the day.
Source: U.S Department of Energy