Light - The pert spectrum of electro magnetic radiation that the human eye perceives as brightness. This area of radiation is between 360 and 830nm (nanometers). This is only a small fraction of the electromagnetic radiation spectrum.
Luminous Flux - A unit of measure: lumen [lm]. All of the radiated power emitted by a light source and perceived by the human eye.
Luminous Intensity - Luminous intensity is a unit measure of the luminous flux in a solid angle.
Luminous Efficiency - Unit of measure: Lumens per watt [lm/W] indicates the efficiency with which the power consumed is converted to light.
Light Color - The light color of a lamp can be defined in terms of color temperature: Warm: Less than 3300K Intermediate: 3300-5000K Daylight: Greater than 5000K
Color Rendering - Lamps have the same color temperature but different rendering properties due to spectral composition of their light. Certain colors of the spectrum are transmitted and appear to the human eye to be brighter than others. Example: yellow appears much brighter than red to most of us.
Color Temperature Unit of measure - Kelvin [K] The color temperature of a light source in comparison with a black body radiator and plotted on a Planckian Curve. The higher color temperature is the greater blue component in the spectrum and the smaller the red component. Daylight bulbs have a color temperature of 6000 K where a warm light would have a color temperature of 2700 K.
FIBER OPTICS LIGHTING BASIC TERMS
Side Glow - trade marked term for side emitting fiber optic cable.
End Glow - trade marked term for end emitting fiber optic cable.
End Point - a term for fiber optics in single strand.
Illuminator - the unit that houses the lamp that illuminates the fiber optic.
Color Wheel - A dichroic glass or plastic filter inside the illuminator for color changing effects. It is connected to a motor that turns the wheel.
Fiber-Head - The device that holds the fibers in position at the illuminator.
Fiber Port - The connection point on the illuminator for the fiber-head.
Loop - Refers to the configuration of cable where both ends of the cable terminate into an illuminator. This way light is projected from both ends for maximum brightness.
Dead-End Run - Refers to a layout for side glow cable where only one end terminates an illuminator. This is only recommended for side glow cable runs under 30 feet or 10 meters.
Light Outlet - This is defined as the termination of afixture at the opposite end of the fiber head.
Hot Knife - A tool used to cut the fiber at the fiber head and light outlets. The heat from the knife produces a smooth surface across the ends of the fiber as well as the proper angle of acceptance for the light to enter or exit the fiber.
LED - (Light Emitting Diode) A Light Emitting Diode is a semi conducting device that emits light when an electric current runs through it. It uses significantly less power, releases less heat, and lasts much longer than incandescent light bulbs.
Diode - Diodes only let current (electricity) to flow in one direction and not the other. LED's are diodes too, but they are producing light when electricity flows through them. LED's are illuminated solely by the movement of electrons in a semiconductor material, and they last just as long as a standard transistor. LED?s are made with two different kinds of semiconductor material. One type that has too many free electrons roaming around inside, and another that doesn't have enough. When an electron from one material gets pushed across a thin barrier and gets into tiny spaces in the other a photon or particle of light is produced.
LED Color - The color of light depends on a number of factors; including the type of material they make the LED with and the materials quantum band gap.
Band gap - is how much energy each electron needs in order to cross the barrier.
Small Band gap - where fairly weak electrons can cross gives you infrared or red light, while a larger band gap that needs really strong electrons gives you light that have a blue or violet color to it.
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