The impact of poor lighting Poor or inappropriate lighting can have serious consequences, increasing the risk of danger and actively disrupting the natural rhythms of all life forms, while wasting huge amounts of energy. For example, excessive exposure to blue light can be harmful as it suppresses the production of melatonin, a hormone that helps to regulate circadian rhythms. It can also affect the behaviour of animals, such as bats and moths, by altering how they move towards or away from light sources.
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