light+vocabulary

=//**Light vocabulary. **//=

·__HID Lamp:__ high intensity discharge lamps have a longer life and provide more light per watt than most other light sources.

·__Louver:__ a type of “screen” made of translucent or opaque material and geometrically designed to prevent lamps from being viewed directly within a given angle.

·__Chandelier:__ a chandelier is often the focal point of the dining room. As such it should be hung about 30 inches above the tabletop and should be at least 6 inches narrower than the table on each side.

·__Dimmer:__ 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.

·__Ballast:__ an electrical device used with fluorescent and HID (high intensity discharge) lamps to supply sufficient voltage to start and operate the lamp but then to limit the current during operation

·__Bollard:__ A short, thick post with a light at its top, used for grounds and outdoor walkway lighting

·__Cool White:__ 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.

·__Instant Start:__ Lamp starting method in which lamps are started by high voltage input with no preheating of lamp filaments.

·__Quad:__ Generally refers to a compact fluorescent lamp containing 4 U-shaped tubes

·__Spot:__ A colloquial term referring to a reflector lamp with a tight beam of light, typically around 10 degrees or less.

·__Wavelength:__ The distance between two neighboring crests of a traveling wave. The wavelength of light is between 400 and 700 nanometers.