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red light sensor with green light showing
Fei C
Fei C May 09, 2013
red light sensor with green light showing

I've seen these sensors...

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Similar Photos: Lutron's Quantum system for total light management in commercial buildings. The lights are connected to daylight sensors. daylightharvesting Creative Inventionland Offices On my bike ride this morning, I took this picture of pavement sensors under the road that sense when to change the traffic light.

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