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LED lighting fixture commonly used parameters to explain the term

From: Data:24/07/2016

LED lighting parameters noun explanation

1, flux: (LM): light source per second issued in the sum of the visible light, used to describe the lamp brightness. Such as the brightness of a 100W incandescent 1000lm, a LED 9W brightness is 900lm. 2, luminous intensity (CD): the luminous flux radiated from the light source in the unit solid angle is the luminous flux emitted by light source in space selected direction distribution density. Light intensity of the unit is Kanter La (CD), also known as the candlelight. Such as: 1 units of three-dimensional point of view to issue a 1 flow clearly defined by the light called 1 Kanter pull (1CD). 3, color temperature (k): it is the simple light color lamp. Such as: a incandescent lamp light about 3000K yellow. The light from a fluorescent lamp is about 6000K. LED lamps commonly used color: warm light 2700-3200K, is white 6000-6500k, luminescence: 8000K over the various manufacturers have different definitions, the midday sun light about to 4500 K. 4, light effect (lm/w): an important indicator of the luminous efficiency of lamps, such as: 100W incandescent lamp brightness is 1000lm so its light effect is only 10lm/W. 9Wled bulb brightness is 900Lm its light effect is 100lm/W. This shows how energy saving LED. 5, color rendering: (RA): the ability to restore the color of objects on the surface of the object. International Lighting Committee CIE the sun's color index is set to 100. The color rendering index of all kinds of light source is different. Such as: incandescent lamp ra≥ 90, fluorescent lamp ra=60~90, LED lamp ra70-80. The color of white light is higher than that of warm light. 6, wavelength: mainly used for plant growth lamp light is an electromagnetic wave but the short wavelength. Red wavelength at 620-660 nm, pure green 520-530nm, blue 470-480nm, yellow 480-590nm, yellow green 550-570nm, please reference chromaticity diagram, different wavelengths of a different color of light; two color mixed light is also different. The growth of different plants requires different wavelengths. 7, the use of life: refers to the LED lamp with the use of time to increase brightness and lower when the brightness of only the factory half time effect decreasing lost the meaning of energy-saving and scrap, different chip used in different environments will have different life. 8, the light fades: all chip in certain conditions, current, temperature, brightness and time curve; in simple terms is with the decrease of time led lamp brightness ratio. In actual use, low working temperature affected by the current increase or decrease. (common market low-priced products with current increase leads to an increase in brightness attenuation greatly, and the service life is greatly discount)