Comlight of Norway has a self-dimming road lighting system it claims can save up a third or more on energy bills. Based on a radar module attached to each lamppost, it cuts intensity to 20% when no cars are present. The radar beams project across the whole road and pavement, then 900MHz local pole-to-pole communication ...
This story continues at Radar auto-dims streetlights to cut monthly power by a third
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from Electronics Weekly https://www.electronicsweekly.com/blogs/led-luminaries/radar-auto-dims-streetlights-cut-monthly-power-third-2018-01/
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