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Many mini sets use standard 3 mm dome-shaped LEDs, and have a plastic cover over them to provide refraction, which is an important step in diffusing the unidirectional light they cast. These covers come in C5, C6, and C7 sizes (5 ⁄ 8, 3 ⁄ 4, and 7 ⁄ 8-inch, or 16, 19, and 22 mm diameters, respectively) pointed "strawberries", G12 (12mm or ...
Decorative street light in Jakarta. Major advantages of street lighting include prevention of automobile accidents and increase in safety. [61] Studies have shown that darkness results in numerous crashes and fatalities, especially those involving pedestrians; pedestrian fatalities are 3 to 6.75 times more likely in the dark than in daylight. [62]
The "Washington Upright Poles" are the most decorative, and are designated the 14, 16, 18, 716, and Twin-20. [a] The Number 16 pole (which cost $5,000 in 2013) is the most commonly used Upright Pole. The 716 is a less expensive ($2,500 in 2013) version of the 16 pole. The slightly more decorative 18 pole is generally used only in the downtown area.
The history of electric light is well documented, [11] and with the developments in lighting technology the profession of lighting developed alongside it. The development of high-efficiency, low-cost fluorescent lamps led to a reliance on electric light and a uniform blanket approach to lighting, but the energy crisis of the 1970s required more design consideration and reinvigorated the use of ...
Mogul lamps are also the subject of a mathematics problem concerning the number of possible combinations of power that can be obtained. As it turns out, the name "Six Way Lamp" is somewhat deceiving since there are in fact 16 possible combinations (without the night-light), including combinations with all lamps of either switch off.
Two modern electric lamps with lampshades. A lampshade is a fixture that envelops the light bulb on a lamp to redirect the light it emits. The shade is often affixed onto a light fixture to reduce the intensity of the light to observers, shield the light from a harsh environment, or for decoration by altering the color or creating shadows.