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 Action 44: Change any high energy light bulbs. Replace them with LED bulbs – these use the least amount of electricity  and yet produce high levels of light (measured in lumen). The Energy Saving Trust provides a useful guide about LED  lighting. https://energysavingtrust.org.uk/how-get-best-out-energy-efficient-lighting/ And they also remind us that turning lights off when not in use is another easy way of saving energy.