Green lighting project

Refers to the promotion by the State Economic and Trade Commission and the United Nations Development Programme, which aims to promote the development of the lighting industry and to build a green lighting environment in the whole society.

Two, green lighting

Refers to the use of efficient green light source, through scientific design, to build an efficient, energy-saving, bright, comfortable lighting environment.

Three, green lighting technology goals

First, the luminous flux emitted by the light source is sufficient, the sunlight is light and color, the proportion of visible light is high, the lighting environment is bright and comfortable.

Two: the sun is light color, good color performance, look no color cast of any color (color).

The three is: flux stability, no fluctuation, no stroboscopic effect harm, no light pollution, lighting environment is conducive to improve productivity.

The four is: green light directly replace the traditional light source power substitution ratio is high, save energy.

Four, the main physical quantity of green light source

(I) light effect

Light efficiency: that is, the light source of each W electric power generated by the light energy (commonly known as luminous flux), unit: lumen / Watt (Lm/w). The more luminous flux per W electric power, the higher the luminous efficiency, the higher the brightness, and the more energy saved.

(two) luminous flux

The electric light source produces the light energy, called the luminous flux, which is the lumen (Lm). In a fixed space, the light flux generated by the electric light source is more abundant, and the visual perception of the surrounding environment is more bright.

(three) the difference between luminous efficiency and luminous flux

Luminous efficiency and luminous flux are two different physical concepts. However, often confused.

Luminous efficiency: it is a physical quantity that represents the electric light source, and transforms the electric energy into light energy efficiency.

Luminous flux: the characterization is an electric light source, in accordance with the established light and electric power, to produce the sum of the emitted light energy.

In the design of practical lighting applications, the concept of the physical meaning of physical reality should be better than the other.

(four) spectral energy distribution and visible light ratio

The luminous flux produced by the light source includes visible light and invisible light. The ratio of visible light is high and low, which is determined by the ratio of spectral energy distribution. In the flux of green light source, the ratio of spectral energy distribution is close to that of sunlight.

Only visible light ratio is high, effective visual light efficiency can be high. The total luminous flux of the green light source should be 3.5--8 times higher than that of the traditional light source. The higher the proportion of visible light, the higher the effective visual light efficiency, the higher the effective visual illumination, indicating that the more advanced technology of electric light source.

(five) effective visual light efficiency

Light effect: a physical concept that describes the performance of a light source. However, in the practical application of lighting design, the concept of the physical meaning of reality should be: effective visual light effect.

When the light source is used for illumination, the visible light is the required luminous flux. Therefore, the number of visible light in the light source is the decisive factor of the effective visual light efficiency. We should identify the comparison, it should be the ratio of the visible light source. In order to identify the proportion of visible light in comparison with the light source, the concept of effective visual light efficiency is introduced. Effective visual light effect: the ratio of the visible light in the flux per unit of luminous flux.

When the luminous flux is constant, the higher the proportion of visible light is, the higher the effective visual light efficiency is, the higher the effective visual illumination is, the more advanced the technical performance of the light source is.

(six) spectral energy distribution and color rendering properties

Color rendering performance is a physical quantity that can represent the original color of the object surface. The color rendering performance of the light source is high and low. In the flux of green light source, the spectral energy distribution is close to that of sunlight. This watch in the surface color, can not produce color, no color, display objects on the surface of the original color. In order to express the color performance, the concept of R value of color rendering index is introduced. The sun light R=100 as the standard, the green light source R value is: R = 85. The bigger the R value, the better the color rendering performance.

(seven) color and color temperature

1, color: green light source to produce luminous flux, one must have enough brightness, two to have a better color. One of the meanings of color: the color of the surface of the light that is seen by the human eye.

The color of the light source is determined by the ratio of the spectral energy distribution of the light source. Different spectral energy distribution ratio, there are different color table. The ratio of the spectral energy distribution of the light source is closer to the ratio of the spectral energy distribution of the sunlight, and the color of the light source is better. Otherwise, the difference.

Measure the color of the light source of good and bad, with the sun as the standard. The color of the surface of the light source is closer to the color of the sun. Otherwise, the difference. For example, high pressure sodium lamp surface yellow, color and light of the sun varies greatly, color difference. The surface of high pressure mercury lamp is white and pure, and the color is different from that of the sunlight.

2, color temperature: the color of the light source, is to describe the color temperature.

The concept of color temperature is: the color of the surface of the luminous body, the temperature of the blackbody at the same time as the black body radiates at a certain temperature, the temperature of the blackbody is defined as the color temperature of the illuminant. Color temperature to K's temperature as a unit, code named 0K.

The color temperature of the light source is divided into low color temperature, medium temperature and high color temperature.

Low color temperature (2700 0K - 3500 0K): contains more red, orange