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Because glow discharge occurs readily at 110-120 volts AC, one could use these bulbs in standard household lamps in the United States. The phosphors used in the bulbs were somewhat brittle, necessitating care in handling. Shaking or jarring the bulbs would cause flaking and migration of the phosphors to other parts of the metallic sculpture.
In SI units illuminance is measured in lux (lx), or equivalently in lumens per square metre (lm·m −2). [2] Luminous exitance is measured in lm·m −2 only, not lux. [4] In the CGS system, the unit of illuminance is the phot, which is equal to 10 000 lux. The foot-candle is a non-metric unit of illuminance that is used in photography. [5]
1 lux < 1 lux: Extreme of darkest storm clouds, sunset or sunrise 10 1: 1 decalux: 40 lux: Fully overcast, sunset or sunrise 10 2: 1 hectolux < 200 lux: Extreme of darkest storm clouds, midday 400 lux: Sunrise or sunset on a clear day (ambient illumination) 10 4: 10 kilolux: 10–25 kilolux: Typical overcast day, midday 20 kilolux
The Autoluxlamp, a kerosene lamp manufactured by Lux and used in railway stations around the world in the early 20th century. The company originates from a merger of two companies—Lux AB and Svenska Elektron AB, the former an established manufacturer and the latter a younger company founded by a former vacuum salesman who had also been an employee of the former firm. [7]
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 lightbulb socket, lightbulb holder, light socket, lamp socket or lamp holder is a device which mechanically supports and provides electrical connections for a compatible electric lamp base. [1] Sockets allow lamps to be safely and conveniently replaced (re-lamping).