Orange County NC Website
Browse       Search
Direct Light : Light emitted directly from the lamp , off of the <br /> reflector diffuser, or through the refractor or diffuser <br /> lens , of a luminaires <br /> Fixture : The assembly that houses the lamp or lamps and <br /> can include all or some of the following parts : a housing , <br /> a mounting bracket or pole socket , a lamp holder , a <br /> ballast, a reflector or mirror , and/or a refractor or lens . <br /> Flood Lamp : A form of lighting designed to direct its output <br /> in a specific direction with a reflector formed from the <br /> glass envelope of the lamp itself. Such lamps are so <br /> designated by the manufacturers and are typically used <br /> in residential outdoor area lighting . <br /> Floodlight : A form of lighting designated to direct its output <br /> in a diffuse , more or less specific direction , with <br /> reflecting or refracting elements located external to the <br /> lamp . <br /> Footcandle : (fc) The illuminance measured one (1 ) foot from <br /> a one (1 ) candela source . <br /> Full Cutoff Fixture : An outdoor lighting fixture shielded or <br /> constructed in such a manner that it emits no light above <br /> the horizontal plane of the fixture . <br /> Fully Shielded : Outdoor light fixtures shielded or <br /> constructed so that no light rays are emitted by the <br /> installed fixture at angles above the horizontal plane as <br /> certified by a photometric test report. <br /> Glare : Light emitting from a luminaire with an intensity great <br /> enough to reduce a viewer ' s ability to see , and , in <br /> extreme cases , causing momentary blindness . <br /> IESNA: The Illuminating Engineering Society of North <br /> America , a non - profit professional organization of <br /> lighting specialists that has established recommended <br /> design standards for various lighting applications . <br /> Light Trespass : The shining of light produced by a <br /> luminaire beyond the boundaries of the property on <br /> which it is located . <br /> Lumen : A unit of luminous flux . One footcandle is one <br /> lumen per square foot. For the purposes of this <br />