LED lighting knowledge basic introduction to lighting

　　In daily life, when purchasing lamps or lighting applications, there are several terms that you may hear, namely "luminous flux", "illuminance", "light intensity" and "brightness". So what do these elements mean? What is the relationship in the light? Today, Xiaoshi will introduce to you:
　　 1. Luminous flux:
　　 The total degree of light emitted by the lamp, unit: lumens ml
　　 For the light source, this quantity describes the total amount of light emitted by the light source, and is equivalent to the light power. The greater the luminous flux, the more light is emitted.
　　 LED lighting knowledge basic introduction to lighting
　　 2. Illumination:
　　 Illumination intensity, referred to as illuminance. Refers to the size of the luminous flux on the illuminated object. Unit: Lux lx.
　　The calculation method is: 1 lx=1 lm/㎡
　　 That is to say: 1 square meter of light to get 1 lumens is called 1 lux.
　　3. Light intensity:
　　 Luminous intensity, referred to as light intensity, is defined as the luminous intensity of the light source in a certain direction. Unit Kander takes the cd.
　　 What is the concept of 1cd? The luminous intensity of an ordinary candle is about 1cd.
　　 4. Brightness:
　　Brightness is a person's perception of the intensity of light, and it is also a subjective quantity. It refers to the brightness of an object "see" by the human eye. Unit: Candela/square meter cd/m2
　　 LED lighting knowledge basic introduction to lighting
　　 5. Lamp power: it can be used to indirectly determine the brightness.
　　 It is relatively accurate to measure brightness by illuminance, but generally for people who buy lamps, illuminance is still not a concept. The value is rarely marked on the product details, so household lighting can be roughly measured by power (wattage).
　　 Under normal circumstances, other conditions are the same, the higher the wattage, the brighter the lamp. (The higher the wattage, the higher the power consumption.) Take the LED light source as an example: it is recommended to have 3-3.5W per square meter for the main lighting space, and 2.5-3W per square meter without the main light.
　　 Standard value of residential building lighting:
　　Note: General activities refer to the average illuminance in the space except for the accent lighting. The 0.75 level refers to the reference height measurement at a distance of 0.75 from the ground to the meter.