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A fluorescent lamp, or fluorescent tube, is a low-pressure mercury-vapor gas-discharge lamp that uses fluorescence to produce visible light. An electric current in the gas excites mercury vapor, to produce ultraviolet and make a phosphor coating in the lamp glow.
0–10 V is one of the first and simplest electronic lighting control signaling systems, used as an early fluorescent dimming system. [1] Simply put, the control signal is a DC voltage that varies between zero and ten volts.
A common dual dimmer module used in stage lighting A dimmer. A dimmer is a device connected to a light fixture and used to lower the brightness of the light.By changing the voltage waveform applied to the lamp, it is possible to lower the intensity of the light output.
Fluorescent bulbs contain mercury, a toxic substance. The United States Environmental Protection Agency (EPA) provides safety guidelines for how to clean up a broken fluorescent bulb. [17] Mercury can be harmful to children and developing fetuses, so children and pregnant women should avoid being in the area whilst a broken bulb is cleaned up. [18]
Circular and U-shaped lamps were devised to reduce the length of fluorescent light fixtures. The first fluorescent light bulb and fixture were displayed to the general public at the 1939 New York World's Fair. The spiral CFL was invented in 1976 by Edward E. Hammer, an engineer with General Electric, [7] in response to the 1973 oil crisis. [8]
Those assigned to bright light therapy were made to sit in front of a fluorescent light box that produced extremely bright white light at an intensity of 10,000 lux for at least 30 minutes daily.
Lamp bulbs with dual carbon filaments were built as early as 1902 to allow adjustable lighting levels. [1] Certain compact fluorescent lamp bulbs are designed to replace 3-way incandescent bulbs, [2] and have an extra contact and circuitry to dim to a similar light level. In recent years, LED 3-way bulbs have become available as well. [3]
Black-light fluorescent lamps Ultraviolet LAP LaPO 4:Ce Ultraviolet 320 nm 38 nm – Medical and scientific UV lamps Ultraviolet SAC SrAl 12 O 19:Ce Ultraviolet 295 nm 34 nm – Lamp Ultraviolet SrAl 11 Si 0.75 O 19:Ce 0.15 Mn 0.15: Green 515 nm 22 nm – Lamp Monochromatic lamps for copiers [37] BSP BaSi 2 O 5:Pb Ultraviolet 350 nm 40 nm – Lamp
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