These are simple devices, with an infra-red LED and a photo-transistor, both facing upwards, but work at an unusual wavelength. “These contain both emitters and detectors for 940nm wavelength,” said ...
In fact, lighting can have an enormous impact on the way our homes look and feel. That’s where LED bulbs come in, helping to set the tone of each room. For example, you can liven up a room with ...
Susan Bard, MD, is a board-certified general and procedural dermatologist with the American Board of Dermatology and a Fellow of the American College of Mohs Surgery. Rich Scherr is an updates ...