A lighting designer found brighter streetlights actually blind CCTV cameras too (spectrum.ieee.org)
LED streetlights went from rare to covering more than half of America's streets by 2019, sold almost entirely on the promise of lower energy bills. Global light pollution is still climbing by nearly 10 percent a year despite that switch.
One HN reader watched his own city get it backwards: after new LEDs replaced old lamps with a tightly aimed beam onto the road, nobody noticed the footpath beside it had gone dark until joggers started running in traffic instead.
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