Lamp lighting industry common words

Just like all other technology industries, the lighting industry also has its own terminology. These special terms and concepts can clearly define the characteristics of light sources and luminaires, and standardize the measurement units. Only by understanding these lighting terms can we better understand the advantages of LED lighting. . The following is a description of the most important terms.

1. Light and light are electromagnetic waves that radiate into people's eyes. They are converted to light by the optic nerves. The wavelengths that can be seen by the naked eye range from 360 to 830 nm, which is only a very small part of the spectrum of electromagnetic radiation.

2. Luminous flux unit: Lumen [lm], 1lm=1cd·1sr

The sum of the energy emitted by the light source and received by the human eye is the luminous flux. Usually we use it as a measure of the brightness of a light bulb. 3, Light intensity I units: Candela [cd]

Luminous intensity, referred to as light intensity, refers to the luminous flux emitted within a certain direction angle (W). In general, light is emitted in different directions and varies in intensity.

5, illumination E units: Lux [lx]

The illuminance (E) is the proportional coefficient between the luminous flux and the irradiated area. 1lx refers to the brightness of 1lm whose luminous flux is evenly distributed in the plane of lm2.

6, brightness L

Unit: Candela/m2 [cd/m]

7. Brightness (L) is the light intensity per unit area of ​​a light source (or illuminated surface) in a certain direction.

8, light efficiency unit: lumens per watt [lm / w]

Light efficiency refers to the efficiency of the conversion of electrical energy into light energy. Normally, we regard it as bulb efficiency.

9, color temperature unit: [K]

The color temperature of the light source is usually used to compare the color displayed with the sun during the day and the color displayed by the ferrous metal when burned to a certain temperature. The dark red → light red → orange yellow → white → Blue-white → blue gradually changes. When the relative burning reaches 6,000 degrees, the color produced by the ferrous metal is equivalent to the color displayed by the sun during the day. 11. The color and the color of the color-emitting object are displayed under the light. The light source under the sun is for comparison. The lower the Ra value, the worse the ability to restore the color of the object. The standard value is Ra100

Ra value below 50 has affected our visual judgment of the color of the object