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Fresnel - Fresnels are typically 8-, 6- or 4-inch, referring to the diameter of the lens. This light is named after Augustin-Jean Fresnel who invented the distinctive Fresnel lens which has a 'stepped' appearan. Used Dimmer. ce instead of the 'full' or 'smooth' appearance of other lenses. The stepped nature of the lens causes a corresponding pattern of circles of light, so Fresnel lenses are usually 'stippl. Used Dimmer. ed' on the flat side. This pattern of small bumps helps to break up the light passing into the lens to smooth out its eventual pattern.

Fresnels use a spherical reflector, with the filament of the bulb ...

Kelvin - The kelvin (symbol: K) is the SI unit of temperature, and is one of the seven SI base units. It is defined by two facts: zero kelvins is absolute zero (when molecular motion stops), and one kelvin is . Used Dimmer. the fraction 1/273.16 of the thermodynamic temperature of the triple point of water. The Celsius temperature scale is now defined in terms of the kelvin, with 0 °C corresponding to 273.. Used Dimmer. 15 kelvins, approximately the freezing point of water under ordinary conditions.

The kelvin is named after the British physicist and engineer William Thomson, 1st Baron Kelvin; his barony was in turn na...

Incandescent light bulb - The incandescent light bulb (archaically known as the electric lamp) uses a glowing wire filament heated to white-hot by electrical resistance, to generate light (a process known as thermal radiation . Used Dimmer. or incandescence). The bulb is the glass enclosure which keeps the filament in a vacuum or low-pressure noble gas, or a halogen gas in the case of quartz-halogen lamps (see below) in or. Used Dimmer. der to prevent oxidisation of the filament at high temperatures. In Australia and South Africa a light bulb is also called a light globe.

Because of its poor efficiency and yellowish color, it is being ...

Cue - Generally, a lighting board operator has a cue sheet for each scene, which is a diagram of the board with the faders in their positions as determined by the lighting designer. The operator sets the fa. Used Dimmer. ders into their positions based on the cue sheets. Typically during a cue, the operator sets the next scene. Then, the operator makes the transition between the scenes using the cross-f. Used Dimmer. ader....

Color - Color temperature is measured in kelvins, and gel colors are organized by several different systems maintained by the color manufacturing companies. The apparent color of a light is determined largel. Used Dimmer. y by the gel color given it, but also in part by the power level the lamp is being run at and the color of material is it to light. As the percentage of full power a lamp is being run a. Used Dimmer. t drops, the tungsten filament in the bulb glows orange instead of more nearly white. This is known as amber drift or amber shift. Thus a 1000-watt instrument at 50% will appear far more orange than a 500-watt instr