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The purpose of this white paper is to describe and demonstrate the effects of dimming on color and efficacy of LED-based lamps. The paper is organized into three main sections: Section 1 describes the properties of LEDs and driving electronics that influence efficacy. Section 2...
This Approved Method provides the methods for measurement of luminous flux and color maintenance for LED packages, arrays, and modules. It covers luminous, radiant, or photon flux maintenance and color maintenance, including changes in chromaticity coordinates, peak wavelength,...
Light Emitting Diodes (LEDs) are no longer confined to use in commercial signage and have now moved firmly, and with unquestioned advantages, into the field of commercial and domestic lighting. This development was prompted in the late 1980s by the invention of the blue LED, a...
This standard applies to LEDs emitting incoherent, visible radiation in solid state lighting applications. It specifies bins and bin codes for LEDs for the following characteristics: Color Lumens Forward Voltage
This SAE Recommended Practice provides the methods of measurements for electrical and photometric characteristics of LED packages. It provides procedures, requirements, and guidelines for the methods of the measurement of luminous flux and color maintenance of LED devices...
This approved method describes the procedures to be followed and precautions to be observed in performing accurate measurements of total luminous flux, total radiant flux (optical power), total photon flux, electrical power, luminous efficacy, color quantities, and wavelength characteristics...
This document recommends the methods for projecting long-term luminous flux maintenance of LED lamps and luminaires using data obtained when testing them per ANSI/IES LM-84-20, Approved Method: Measuring Optical Radiation Maintenance of LED Lamps, Light Engines, and Luminaires, as...
This document provides recommendations for projecting flux maintenance of LED light sources using data obtained when testing them per ANSI/IES LM-80-15, Approved Method for Measuring Luminous Flux and Color Maintenance of LED Packages, Arrays and Modules. This method shall not...
This document provides recommendations for projecting long-term chromaticity coordinate stability of LED light sources using data obtained per ANSI/IES LM-80-15, Approved Method: Measuring Luminous Flux and Color Maintenance of LED Packages, Arrays, and Modules. This method...
This approved method describes the procedures to be followed and precautions to be observed in performing optical and electrical measurements of AC-LEDs for total luminous flux, total radiant flux, total photon flux, color characteristics, electrical voltage, current, and power. This...
Design, build, and test LED-based projects using the Raspberry Pi About This Book Implement real LED-based projects for Raspberry Pi Learn to interface various LED modules such as LEDs, 7-segment, 4-digits 7 segment, and dot matrix to Raspberry Pi Get hands-on experience...
This standard applies to all local and formal investigations that are led by Network Rail. Purpose To provide a consistent, comprehensive and structured process for Network Rail led local and formal investigations.
INTRODUCTION Solid-state lighting using light-emitting diodes (LEDs) is set to radically alter the profile of the lighting industry, and has the potential to deliver substantial energy savings. A US study has predicted that, by 2027, solid-state lighting will constitute nearly half the...
General Rapid progress in lighting technology research and development is resulting in general illumination, "white light" light emitting diodes (LEDs) that are approaching, and in some cases surpassing, the performance of traditional light sources. LEDs, however, differ from...
This TI applies to the replacement of conventional SL35 or SL18 lamps and ER with an LED SL35 module and dummy ER by staff holding Signal Maintenance Testing competence. Purpose This TI mandates the process to be applied when installing LED SL35 modules and associated dummy ER units....
The purpose of this Standard is to describe a method to establish reasonable claims of initial light output equivalency for single-ended omnidirectional LED replacement lamps that are intended to replace HID lamps. The method accounts for two factors that influence the equivalency claims: a....
This European Standard specifies the requirements for measurement of electrical, photometric, and colorimetric quantities of LED lamps, modules, light engines and luminaires, for operation with AC or DC supply voltages, possibly with associated control gear. Photometric and colorimetric...
This standard applies to all local investigations that are led by Network Rail. Purpose To provide a consistent, comprehensive and structured process for Network Rail led local investigations.
This Standard specifies energy efficiency and performance requirements for LED luminaires of the directional and non-directional type used for general illumination, including commercial and residential, indoor and outdoor, as well as those with a significant decorative function. Notes: 1)...
