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Miniature lights first came in sets of 35 (3.5 volts per bulb), and sometimes smaller sets of 20 (6 volts per bulb). For a short time, these early miniature lights were manufactured using E5 screw bases, rather than the current wedge base and were called "Italian lights".
Laser light shows fully emerged in the early 1970s and became a form of psychedelic entertainment, usually accompanied with a live musical performance on stage or pre-recorded music. The Who , Pink Floyd , Led Zeppelin , Genesis , and Electric Light Orchestra were among the first high-profile rock acts to use lasers in their concert shows in ...
The electrical-to-optical conversion efficiency of modern laser technology can be as high as 85%, [8] and off-the-shelf semiconductor diode lasers can have an output efficiency of around 50%. [9] The optical-to-electrical conversion efficiency of a photovoltaic receiver can be over 50% for monochromatic (or laser) light. [10]
The laser light show at Grand Coulee Dam, which began in 1989, is one of the largest light shows in the U.S. The 37 minute show runs daily from Memorial Day through September 30. An addition of fireworks lights up the sky above the dam each Memorial Weekend Sunday and July 4. The Grand Coulee Dam premiered its first non-laser light show in 1957 ...
Red (635 nm), blueish violet (445 nm), and green (520 nm) laser pointers. A laser pointer or laser pen is a (typically battery-powered) handheld device that uses a laser diode to emit a narrow low-power visible laser beam (i.e. coherent light) to highlight something of interest with a small bright colored spot.
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Similarly, designing lighting systems that maximize the right amount of light at the appropriate time of day for the elderly may help relieve symptoms of Alzheimer's disease. The human circadian system is entrained to a 24-hour light-dark pattern that mimics the earth's natural light/dark pattern.
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