27 terms related to LEDs
27 terms related to LEDs
1. Luminous flux - the energy of the light emitted by the light source in unit time, called the luminous flux, also known as the light beam (φ).
2. Brightness - light source in a certain direction, per unit of light through the transmission area of ​​luminosity.
3. Illuminance - the amount of light incident per unit area, that is, the light beam divided by the area (m2) value is used to indicate the brightness of a place.
4. Color Temperature - When the color of the light emitted by the light source is the same as the color radiated by the "black body" at a certain temperature, the temperature of the "black body" becomes the color temperature of the light source. The higher the temperature of "blackbody", the more the blue component in the spectrum, and the less the red component. For example: incandescent light color is warm white, the color temperature is expressed as 2700K, and daylight fluorescent color temperature is 6000K
5: light color - light color is actually color temperature, roughly divided into three categories: warm color <3300K, 3300K-5300K intermediate color, daylight color> 5300K. Due to the difference in the composition of the spectrum in the light, the electro-chromic properties may be different even if the light colors are the same.
6: LED lamp efficiency - Lamp efficiency (also called light output factor) is an important measure of the energy efficiency of lamps and lanterns, it is the luminous flux output lamps and lanterns luminous flux output ratio between.
7: light efficiency - that is, the amount of light emitted by each watt of electricity, the higher the value that the higher the efficiency of the light source, so for long-term use of places such as office corridors, roads, tunnels, the efficiency is usually An important consideration.
8: Brightness - the unit projection surface of a light source in one direction reflects the quantity of light in a unit solid angle, which is called the brightness of a light source in a certain direction. Symbol L, in cd / m2 (candela per square meter)
9: Glare - High brightness objects in the field of view or a strong contrast in brightness, resulting in visual discomfort called glare. Glare is an important factor affecting the quality of lighting .
10: Power Factor - The ratio of useful and apparent power (the product of voltage and current) in the circuit.
11: Color Rendering - In principle, the artificial light should be the same as the natural light, the naked eye can be used to correctly identify the color of the object, and the color of the light source for the color of the object is often referred to as the color rendering index (Ra).
12: The average life - that is, rated life, is the time when 50% of the lights fail.
13: Beam angle - Beam angle refers to the angle between the maximum light intensity of the fixture 1/2.
14: Warm Color - The color temperature of warm color light is under 3300K, the warm color light and incandescent lamp are similar, the red light component is more, which can give a warm, healthy and comfortable feeling. For home, house, dormitory, hotel and other places or places with low temperature.
15: Cool white light - also known as neutral color, its color temperature at 3300K-5300K above, the light source close to natural light, a bright feeling, people concentrate. For shopping malls, hospitals, offices, restaurants, restaurants, waiting rooms and other places.
16: cold light - also known as fluorescent, its color temperature at 5300K or more, the light source close to natural light, a sense of brightness, people concentrate. For offices, conference rooms, classrooms, drawing room, design room, library reading room, exhibition windows and other places.
17: 3G energy-saving lighting - that is both healthy, energy saving, environmental protection, the three major technologies CCFL light source.
18: Visual Homework - The process of observing the details and goals that are presented in the context of work and activity.
19: Reference Plane - A plane that measures or specifies the illumination.
20: Brightness Contrast - The ratio between the brightness difference of the background and the brightness of the background in the field of view
21: Identification of objects - objects and details of identification (such as points to be identified, lines, scars, stains, etc.).
22: Maintenance factor - The ratio of the average illuminance or the average brightness obtained on the same surface of the device newly installed under the same conditions after a certain period of time has elapsed since the device has been used for a certain period of time.
23: General lighting - Uniform lighting to illuminate the entire space.
24: Partition General Lighting - For a specific area, such as the place of work, a different illumination is designed to illuminate the area's general lighting.
25: Local lighting - Lighting intended for a specific visual work to illuminate a part.
26: Hybrid lighting - lighting consisting of general lighting and local lighting.
27: Normal lighting - Indoor and outdoor lighting used under normal conditions
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