Knowledge

LED Glossary U/V/W

U Uniform Code Council (UCC) The 12 digit case code derived from the last 12 digits of the 14 digit SCC code on GE’s case content label. Underwriters Laboratories (UL) A private organization which tests and lists electrical (and other) equipment for electrical and fire safety according to recognized UL and other standards. A UL listing is not... [Read more of this review]

Glossary S T

S State and County Code (SCC) The full 14 digit case code used on GE’s content label. Scotopic Vision where the rods of the retina are exclusively responsible for seeing, typically like the light levels in the countryside on a moonless, starlit night (See also PHOTOPIC , FOVEA, FOVEAL VISION MESOPIC ). Scotopic/Photopic (S/P) Ratio This measurement... [Read more of this review]

Glossary Q-R

Q Quad Generally refers to a compact fluorescent lamp containing 4 U-shaped tubes. Quartz A name for fused silica or melted sand from which many high-temperature containers are fashioned in the lighting industry. Quartz looks like glass but can withstand the high temperatures needed to contain high intensity arc discharges. Quartz-Halogen Lamp (See... [Read more of this review]

Glossary P

Package LED’s are available in either leaded-through-hole, or surface-mount packages. Through-hole LED’s are ideal for wave solder circuit board applications. Most through-hole LED’s are 2-leaded devices. Common through-hole package sizes include 3mm (T-1) and 5mm (T-1 *) diameter parts. Whereas, surface-mount packages are best used... [Read more of this review]

Glossary O

Open Circuit Voltage (OCV) Open Circuit Voltage measured across the socket the lamp screws into, with the ballast powered on. It is dangerous to stick a voltmeter into such a socket without precise knowledge of the ballast because exceedingly high voltages could be present. Open Fixture Rated Lamps that are approved for burning in open fixtures (as... [Read more of this review]

Glossary-M-N

Maximum Overall Length (M.O.L.) The end-to-end measurement of a lamp, expressed in inches or millimeters. Mean Lumens The average light output of a lamp over its rated life. Based on the shape of the lumen depreciation curve, for fluorescent and metal halide lamps , mean lumens are measured at 40% of rated lamp life . For mercury , high-pressure sodium... [Read more of this review]

Glossary-L

Lamp The term used to refer to the complete light source package, including the inner parts as well a the outer bulb or tube. “Lamp”, of course, is also commonly used to refer to a type of small light fixture such as a table lamp. Lamp Description The lamp’s identification code. For Projection lamps, this is a 3-letter-number code... [Read more of this review]

Glossary-I-J-K

Ignitor An electronic device providing a high voltage pulse to initiate an electrical discharge. Typically, the ignitor is paired with or is a part of the ballast (See STARTER ). Illuminance The “density” of light (lumens/area) incident on a surface; i.e. the light level on a surface. Illuminance is measured in footcandles or lux . Illuminance... [Read more of this review]

Glossary-G-H

G General Lighting (See AMBIENT LIGHTING ) Glare Visual discomfort caused by excessive brightness is called discomfort glare. If task performance is affected it is called disability glare. Glare can be direct glare or indirect (reflected) glare (See VEILING REFLECTIONS and VISUAL COMFORT PROBABILITY ). H Halogen Lamp A halogen lamp is an incandescent... [Read more of this review]

Glossary-F

Federal Communications Commission (FCC) The U. S. Federal agency that regulates emissions in the radio frequency portion of the electromagnetic spectrum. Part 18 of the FCC rules specifies electromagnetic interference (EMI) from lighting devices operating at frequencies greater than 9 kilohertz (kHz). Typical electronically-ballasted compact fluorescent... [Read more of this review]

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