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Decades before the video revolution of the late 1970s/early 1980s, there was a small but devoted market for home films in the 16 mm, 9,5 mm, 8 mm, and Super 8 mm film market. Because most individuals in the United States owning projectors did not have one equipped with sound, vintage silent films were particularly well-suited for the market.
Ultra-high-performance lamp. An ultra-high-performance lamp, often known by the Philips trademark UHP, is a high-pressure mercury arc lamp. [1] These were originally known as ultra-high-pressure lamps, [2] [3] because the internal pressure can rise to as much as 200 atmospheres when the lamp reaches its operating temperature.
Slide projectors (2" × 2"; 5 cm x 5 cm) 35mm filmstrip projectors; Overhead presentation projectors (all models) Stereo cameras and stereo slide projectors through its TDC subsidiary; Slide Cube Projector, circa 1970; In 1934, Bell & Howell introduced their first amateur 8mm movie projector, in 1935 the Filmo Straight Eight camera, and in 1936 ...
Ultra-high performance (UHP) HID lamps are used in LCD or DLP projection TV sets or projection displays as well. HID lamps have made indoor gardening practical, particularly for plants that require high levels of direct sunlight in their natural habitat; HID lamps, specifically metal-halide and high-pressure sodium, are a common light source ...
In contrast, a modern LCD or DLP projector often uses an Ultra-high-performance lamp which has a higher luminous efficacy and lasts for thousands of hours. [5] A drawback of that technology is the warm up time required for such lamps. Older overhead projectors used a tubular quartz bulb which was mounted above a bowl-shaped polished reflector.
The company grew rapidly to become Thorn Lighting, one of the world's largest producers of lamps, luminaires and lighting components. The name changed again to Thorn Electrical Industries in November 1936. The company later began to diversify by buying the electronics firm Ferguson Radio Corporation in the late 1950s and Ultra Electronics in ...