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A USB-powered decorative Christmas tree. A USB decoration is a decorative device that uses the Universal Serial Bus (USB) connector for electrical power, and sometimes the protocol, on a computer or other host. In addition, some lightweight devices (e.g., a small lamp on a gooseneck stalk) use the USB connector itself for mechanical support.
The light measurements are more directly related to the use of flashlights than is the nominal power input to the lamp (watts), since different LED and incandescent lamp types vary widely in the amount of light produced per watt. Even the same LED or lamp in different optical systems will show different beam characteristics.
In 1937, Jac Jacobsen, the founder of Luxo, invented the Luxo L-1 lamp (a modification of the earlier Anglepoise lamp). The lamp, a type of balanced-arm lamp was the inspiration for the 1986 animated short film, Luxo Jr., by Pixar Animation Studios. [3] The short subsequently became the subject of a lawsuit from Luxo. [4] [5]
A Tizio desk lamp. Tizio is a desk lamp created by Richard Sapper for Artemide in 1972. [1] It was selected for the Compasso d'Oro industrial design award in 1979. An item of it is part of the collections of the Metropolitan Museum of Art [2] and of the Museum of Modern Art.
To allow for voltage drops, the voltage at the host port, hub port, and device are specified to be at least 4.75 V, 4.4 V, and 4.35 V respectively by USB 2.0 for low-power devices, [a] but must be at least 4.75 V at all locations for high-power [b] devices (however, high-power devices are required to operate as a low-powered device so that they ...
Mechanically powered flashlights were distributed by aid organizations to survivors of the 2010 Haiti earthquake since electric power was lost for a long period. A mechanically powered flashlight (UK: mechanically powered torch ) is a flashlight that is powered by electricity generated by the muscle power of the user, so it does not need ...