Knowledge

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]

Glossary-E

Eccentricity (Maximum) In High Intensity Discharge lamps the Bulb to Arc Angle is the angle off of center between electrodes and bulb. The Bulb to Base Angle is the angle off of center that the bulb is from the base. GE Edison Award An annual competition where lighting designers submit their best projects. The entries are judged by an international... [Read more of this review]

Glossary-D

Daylight Harvesting Lighting design for building interiors that makes of daylight as a way of reducing energy consumption. Daylight Lamp A lamp resembling the color of daylight, typically with a color temperature of 5500 K to 6500K Dichroic Reflector (or Filter) A reflector (or filter) that reflects one region of the spectrum while allowing the other... [Read more of this review]

Glossary-C

Canadian Standards Association (CSA) An organization that writes standards and tests lighting equipment for performance as well as electrical and fire safety. Canadian provincial laws generally require that all products sold for consumer use in Canada must have CSA or equivalent approval. Candela (cd) The measure of luminous intensity of a source... [Read more of this review]

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