Type of light          source Luminous efficiency (Lm/W)     Color rendering index Ra       Color temperature (K)       Average life (hours)

Incandescent bulb                       15        100         2800        1000

Ordinary fluorescent lamp          70          70     full series     8000

√Metal halide lamp    75-95      65-92         3000/4500/5600 6000-20000

Tri-color fluorescent lamp          96       80-98   full series    10000

√High pressure sodium lamp    120    23/60/90    1950/2200/2500    24000

√ Low pressure sodium lamp     200        44           1700         28000

Quartz halogen lamp                  15        100            3000      2000-3000

High-pressure mercury lamp       50        45           3300/4300    6000

Induction lamp (Lvd)                    65        80           2700/6500    60000

Promise QL lamp                          70         85          3000/4000    80000

From this table, the relative brightness of various light sources can be roughly calculated. According to the national standard, the secondary arterial road requires more than 15Lx, that is to say, setting a lamp's lighting range of 200 square meters requires 3000Lm of luminous flux, which can be converted into the required wattage of the light source.

However, in most cases, the actual lighting requirements are higher than this national standard figure. Generally, the luminous flux of street lights above six meters can not be less than 6000Lm, and courtyard lights below six meters can be about 4000Lm. For high and low pressure sodium lamps with poor color rendering index, it is necessary to increase the luminous flux correspondingly to change the warm red light.

As a street lamp, the country advocates the use of high and low pressure sodium lamps because their luminous flux is relatively high, which can reduce the wattage and reduce power consumption. Other new gas discharge lamps such as electrodeless lamps are also promoted. At present, the main street lights used in China are basically three types with (√) above.

The practical application of "low-carbon home decoration" in home lighting

Natural light is preferred for decoration lighting, and natural light is used as the main decoration element of the design. Choosing appropriate lighting control energy-saving methods and lighting intelligent control management systems can reduce unnecessary electricity consumption costs. In lighting design, a reasonable illuminance value is selected according to the functional requirements and visual characteristics of the room. In places with high illuminance requirements, use less general lighting methods, and more use mixed lighting methods, and promote the use of high-efficiency and long-life light sources, such as T4 and T5 series of thin-tube fluorescent lamps and compact fluorescent lamps. Choose energy-saving lamps, especially recommended to use LED energy-saving lamps, LED lamps have the characteristics of energy saving, power saving, emission reduction, etc., fully in line with the spirit of the national low-carbon economy. A 10-watt LED lamp can produce 8 to 10 times the brightness of ordinary energy-saving lamps, but only consumes about 1/8 of the power of ordinary energy-saving lamps. And it doesn't generate heat, which really reduces carbon emissions. Lamps should be set with single-on control switches as much as possible, even one way control by the window, and one way control away from natural light. Turn off the window lighting during the day and get lighting as needed.