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What is Lighting Distribution, Lighting Power, Color temperature, Lighting measurements?.
LED and OLED sources, How it works. What's good and what's bad.
Types of ballasts and dimming controls. Dimming Protocols, limitations and benefits.
Energy references and what to consider when designing lighting for commercial and residential applications in modern environment.
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A complete lighting unit consisted of a light source and driver together with parts to distribute light.
Solid State Lighting. Refers to a type of lighting that uses semiconductor light-emitting diodes (LEDs), organic light-emitting diodes(OLED), or polymer light-emitting diodes (PLED) as sources of illumination.
Light Emitting Diode is a semiconductor light source.
Organic Light Emitting Diode is a light-emitting diode (LED) in which the emissive electroluminescent layer is a film of organic compounds which emits light in response to an electric current. This layer of organic semiconductor material is sandwiched between two electrodes. Generally, at least one of these electrodes is transparent.
Luminous flux (lumen). the basic unit used to measure the flow of light in the SI system, equal to the amount of light emitted through a solid angle of one steradian by a light source with the intensity of one candela (0.0015 watt)
Is the SI base unit of luminous intensity; that is, power emitted by a light source in a particular direction. A common candle emits light with a luminous intensity of roughly one candela. If emission in some directions is blocked by an opaque barrier, the emission would still be approximately one candela in the directions that are not obscured.
Is a derived unit of power in the International System of Units (SI)
Efficacy - Lm/Watt
Luminous efficacy is a figure of merit for light sources. It is the ratio of luminous flux (in lumens) to power (usually measured in watts).
Color correlated temperature is the color temperature of a black body radiator which to human color perception most closely matches the light from the lamp. Color temperature is a characteristic of visible light that has important applications in lighting, photography, videography, publishing, manufacturing, astrophysics, and other fields.
The eight ANSI defined MacAdam ellipses (2700k, 3000k, 3500k, 4000k, 4500k, 5000k, 5700k, and 6500k)
There are also:
Amber or "Wide life", Tunable white that has controllable range from warmer to cooler CCTs RGB - color changing or color tunable light based on tree colors Red, Green and Blue RGBW - that adds white component to RGB system RGBY - with Yellow component to accentuate orange and yellow colors, that otherwise are not easily achievable with standard RGB.
Warm dimming LED - contrary to standard LED which keeps practically the same CCT when dimmed, the warm dimming simulates incandescent lamp when dimmed down, by warming light - changing CCT from usually 3000K or 3500K or 4000K to less than 2400K.
Color rendering index, or CRI, is a measure of the quality of color light, devised by the International Commission on Illumination (CIE). It generally ranges from zero for a source like a low-pressure sodium vapor lamp, which is monochromatic, to one hundred, for a source like an incandescent light bulb, which emits essentially blackbody radiation.
It is related to color temperature, in that the CRI measures for a pair of light sources can only be compared if they have the same color temperature. The highest attainable CRI is 100. Lamps with CRIs above 70 are typically used in office and living environments. LED source 80 CRI minimum (indoor).
IESNA Approved Method for the Electrical and Photometric Measurements of Solid-State Lighting Products," will specify procedures for measuring total luminous flux, electrical power, luminous efficacy, and chromaticity of SSL luminaires and replacement lamp products.
Provides the method for determining when the “useful lifetime” of an LED is reached. The method restricts which values can be used in the calculation based on the sample size, number of hours and intervals tested, and test suite temperature. It also limits the extrapolation for max hours to 6X the hours tested.
IESNA Approved Method for Measuring Lumen Depreciation of LED Light Sources, specifies procedures for determining lumen depreciation of LEDs and LED modules (but not luminaires) related to effective useful life of the product. Defines Lumen Maintenance Life: L70 (hours): 70% lumen maintenance L50 (hours): 50% lumen maintenance 70% of initial lm to 35,000 hours (commercial) or 25,000 hours (residential)
National Electrical Code requires that most SSL products must be installed in accordance with the National Electrical Code.
47 CFR Part 15
Radio Frequency Devices, specifies FCC requirements for maximum allowable unintended radio-frequency emissions from electronic components, including SSL power supplies and electronic drivers. The Federal Communications Commission (FCC), Washington, D.C., www.fcc.gov, is an independent U.S. government agency, directly responsible to Congress.
The FCC was established by the Communications Act of 1934 and is charged with regulating interstate and international communications by radio, television, wire, satellite, and cable.
CCT (IESNA LM-79, LM-58, LM-16, and CIE 15-2004)
Color spatial uniformity (IESNA LM-79, LM-58, LM-16, and CIE 15-2004)
Color maintenance (ANSI C78.377A, IESNA LM-79, LM-58, and CIE 13.3-1995) Referenced resources: IESNA, ANSI, National Electrical Code, NFPA, CIE, FCC