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Energy saving light bulbs were invented as a greener alternative to traditional bulbs, needing 90% less electricity to produce the same light, according to the Centre of Sustainable Energy. But how do they do it?

As bright ideas go, it’s almost impossible to overstate the impact the humble light bulb has had on human civilization. Before Thomas Edison had the original ‘light bulb moment’ and patented his invention all the way back in 1879 people were literally living in the dark ages, according to the Franklin Institute. People depended on oil or gas lamps and candles to light their rooms and streets, and when the sun went down the world would look much duller than it does today. 

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