3/6/2010 · Photocell. A photocell is a resistor that changes resistance depending on the amount of light incident on it. A photocell operates on semiconductor photoconductivity: the energy of photons hitting the semiconductor frees electrons to flow, decreasing the resistance. An example photocell is the Advanced Photonix PDV-P5002, shown in Figure 21.2.
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17/8/2020 · LED is a highly energy efficient lighting technology, and has the potential to fundamentally change the future of lighting in the United States. Residential LEDs -- especially ENERGY STAR rated products -- use at least 75% less energy, and last 25 times longer
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LED versus high-pressure sodium: High-pressure sodium lights have generally long lifespans, thus their presence in industrial environments that require nonstop lighting. However, similar to metal halide lights, they require long warm-up periods and have terrible color rendering.
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