Light+Vocabulary

Ambient Lighting** The general lighting present in an area --excluding task lighting and accent lighting but including general lighting and daylight streaming in.
 * [[image:ambient_lighting.jpg width="118" height="79" align="left"]]

A style of bulb base which uses keyways instead of threads to connect the bulb to the fixture base. The bulb is locked in place by pushing it down and turning it clockwise.
 * [[image:bio_bayonet_bulb.jpg width="118" height="108" align="right"]]Bayonet**

A popular term referring to a light source emitting mostly near UV (320 to 400 nm) and very little visible light
 * Black Light**

Coil** Windings of copper or aluminum wire surrounding the steel core in ballast. Also refers to the entire assembly comprising the inductor or transformer.
 * [[image:diy_coil_denitrator_overview.jpg width="117" height="97" align="right"]]

Draws attention to the fact that this is a lamp with high color rendering, which helps objects and persons illuminated to appear more true to life.
 * [[image:fig3.jpg width="171" height="77" align="left"]]Color Rendering Indicator**

A term loosely used to denote a color temperature of around 4100 K. The Cool White (CW) designation is used specifically for T12 and other fluorescent lamps using halophosphors and having a CRI of 62.
 * Cool White**

Component of electromagnetic ballast that is surrounded by the coil. Core is comprised of steel laminations or solid ferrite material.
 * Core**



It is a device in an electrical circuit used for varying the brightness of lamps in a lighting installation. Dimming controls are ideal for almost any type of room because they can change the amount of lighting to suit each mood or activity and they can help you look good. The use of dimmers with incandescent, xenon, and halogen light sources also **//increases//** the life of the lamps and //**decreases**// the use of electrical energy.
 * Dimmer**

A curve depicting the sensitivity of the human eye as a function of wavelength (or color). The peak of human eye sensitivity is in the yellow-green region of the spectrum. The normal curve refers to photopic vision or the response of the cones.
 * Eye Sensitivity**

A unit of illuminance or light falling onto a surface. It stands for the light level on a surface one foot from a standard candle. One footcandle is equal to one lumen per square foot. See also Lux.
 * [[image:footcandle.gif align="right"]]Foot Candles**


 * [[image:pnrs80-475am.jpg width="113" height="99" align="left"]]Pendant**: pendant lights can provide both task and general lighting. Equipped with shades or globes to avoid glare, they are suspended from the ceiling over dinette tables, game tables, kitchen counters, or other work areas. When used over end tables or night tables, they free up the space occupied by table lamps. In general, pendants should be hung about 30 inches above the tabletop and be about 12 inches narrower than the table on all sides. Not to be confused with a jewelry pendant, which is usually a small to medium-sized ornamental piece of jewelry attached to a necklace or bracelet.


 * Sky Glow**: also, known as "light pollution". The "haze" or "glow" that surrounds highly populated areas and reduces the ability to view the nighttime sky. Specifically, light that enters the sky from an outdoor lighting system by indirect light reflected from atmospheric particles such as fog, dust, or smog.