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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.
Not only does it allow us to plug in our USB devices but it gives us more outlets for lamps, TV, media devices, etc. Very handy and seems to provide adequate USB power." Amazon.
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.
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 ...
Light fixtures may also have other features, such as reflectors for directing the light, an aperture (with or without a lens), an outer shell or housing for lamp alignment and protection, an electrical ballast or power supply, and a shade to diffuse the light or direct it towards a workspace (e.g., a desk lamp).
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]
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