|A Philips MA50 dayburning|
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Dayburning occurs when a street light is abnormally activated during daylight. For economical and environmental reasons, street lights are designed to only activate when natural light drops below a certain level. However, due to self-reacting, which is particularly common in older SOX based sodium lamps, the lantern can abnormally activate at other times of the day. Should this happen, it may indicate that the lantern needs replacing.