Light_Vocabulary

Technically means that the light fixture is permanently connected to an electrical source. The light fixture is **not ** hardwired if it gets power via a cord & plug.  ** **Neodymium ** : ** A rare earth element discovered in 1885 with an atomic number of 60 in the Periodic Table of Elements. It is a fairly common silvery metal that is used to make slightly purple glass envelopes for incandescent light bulbs, eye protection goggles for welding and glass blowing, laser rods, filters to color correct light for art displays, and lenses used by astronomers to calibrate spectrometers, optical instruments used for analyzing light. Using this substance in an incandescent light bulb makes it less "yellowish" and more like natural outdoor light; however, the use of these "daylight" light bulbs can "expose" the flaws or inconsistencies in things. **MR11 Lamp **: A halogen metalized reflector lamp (light bulb) that measures 11/8 inches in diameter and which directs a sharp, well-defined beam of light.
 * Hardwired: **

**MR16 Lamp **: A halogen mirrored reflector lamp that measures 16/8 inches in diameter and which directs a sharp, well-defined beam of light. **IP Ratings **<span style="font-family: 'Century Gothic',sans-serif; font-size: 12pt; line-height: 115%;">: <span style="font-family: 'Century Gothic',sans-serif; font-size: 12pt; line-height: 115%;">Ingress Protection (IP) ratings, developed by the European Committee for Electro Technical Standardization, are used to specify the environmental protection an enclosure provides to the electrical equipment inside that enclosure. An IP rating normally has two numbers associated with it: (1) protection from solid objects or materials and (2) protection from liquids (water). **<span style="font-family: 'Century Gothic',sans-serif; font-size: 12pt; line-height: 115%;">Work Plane **<span style="font-family: 'Century Gothic',sans-serif; font-size: 12pt; line-height: 115%;">: <span style="font-family: 'Century Gothic',sans-serif; font-size: 12pt; line-height: 115%;">The horizontal plane (a flat surface) on which a visual task (such as reading or writing) is performed. Illumination is designed for this plane, which is normally the height of a standard table (approximately 30 inches from the floor). **<span style="font-family: 'Century Gothic',sans-serif; font-size: 12pt; line-height: 115%;">Troffer **<span style="font-family: 'Century Gothic',sans-serif; font-size: 12pt; line-height: 115%;">: <span style="font-family: 'Century Gothic',sans-serif; font-size: 12pt; line-height: 115%;">A large recessed ceiling luminaire (light fixture) that often uses 1-4 T5, T8, or T12 fluorescent lamps (light bulbs), usually measures 24in by 48in or 24in by 24in, and is usually installed with the opening flush with the ceiling **<span style="font-family: 'Century Gothic',sans-serif;">Wall Grazing **<span style="font-family: 'Century Gothic',sans-serif;">: <span style="font-family: 'Century Gothic',sans-serif;">A lighting term that refers to the dramatic highlight and shadow effects on uneven surfaces such as draperies, stone, and brick. Grazing creates easily distinguishable high and low levels of light on the irregular surface. **Wall Washing**<span style="font-family: 'Century Gothic',sans-serif; font-size: 12pt; line-height: 115%;">: <span style="font-family: 'Century Gothic',sans-serif; font-size: 12pt; line-height: 115%;">A lighting technique that produces a relatively smooth, even level of illumination on a wall that minimizes the apparent texture of the surface **<span style="font-family: 'Century Gothic',sans-serif; font-size: 12pt; line-height: 115%;">Snoot **<span style="font-family: 'Century Gothic',sans-serif; font-size: 12pt; line-height: 115%;">: <span style="font-family: 'Century Gothic',sans-serif; font-size: 12pt; line-height: 115%;">A protruding hollow cone of opaque material that provides a high cut-off angle for certain types of track fixtures, landscape lights, or spotlights. A snoot focuses light into a small area and is often used in art gallery lighting, landscape lighting, or theater lighting. **<span style="font-family: 'Century Gothic',sans-serif; font-size: 12pt; line-height: 115%;">Spread Lens **<span style="font-family: 'Century Gothic',sans-serif; font-size: 12pt; line-height: 115%;">: <span style="font-family: 'Century Gothic',sans-serif; font-size: 12pt; line-height: 115%;">A lens used in the front of a luminaire designed to diverge light evenly in all directions. Also called a prismatic lens, it is designed with perpendicular ribs on one side of the lens.