年表作成・共有サービス - pastport

https://www.ledmeen.com/products/lw-46r-led-linear-recessed-lighting-with-trim.html

With the rapid development of national road traffic construction, the construction scale and number of highway tunnels are also increasing, and tunnel lighting also has problems such as energy saving and safety that need to be solved. With the maturity of LED light source technology, lighting The industry has also carried out research and application practice of LED application in highway tunnel lighting. Therefore, linear track lighting fixtures combined with advanced control methods in tunnel lighting, using a new generation of light sources with high light efficiency, good stability and long life will become a new generation of light sources. A need and trend.

1. Brightness of linear track lighting fixtures

Since the brightness outside the tunnel during the day is much higher than that inside the tunnel, when the driver drives into the tunnel, the vision needs to have a certain adaptation time before he can see the inside of the tunnel. This phenomenon is called "adaptation lag phenomenon" "If there is no proper transition, a black hole phenomenon will occur, causing the driver to temporarily lose normal visual function, which will bring certain safety hazards. The black hole phenomenon is a visual problem that occurs before entering a tunnel, and it is also the most important problem in tunnel lighting. To this end, tunnel lighting is usually divided into entrance lighting, interior lighting and exit lighting. The brightness of the tunnel entrance lighting during the day should be determined according to the brightness outside the tunnel, the speed of the vehicle, the field of view at the entrance and the length of the tunnel. The threshold segment is to eliminate the "black hole" phenomenon, and the lighting level in the transition segment is further gradually decreased, thereby providing the driver with time for visual dark adaptation.

2. Uniformity of linear track lighting fixtures

Good visual function not only requires a good average brightness, but also requires that the average brightness on the road surface and the minimum brightness should not be too different. If the brightness difference in the field of view is too large, the bright part will form a glare source, and the change of brightness and darkness will bring a certain stroboscopic effect, which will then affect the vision. Fatigue can also increase.

3. The glare of linear track lighting fixtures

The formation of glare is due to the existence of extremely high brightness or brightness contrast in the field of view, which reduces visual function or makes the eyes feel uncomfortable. Glare in tunnel lighting can come from oncoming vehicle headlights, tunnel lighting fixtures, high brightness outside at tunnel exits, and the like. Glare will reduce people's ability to recognize obstacles and endanger driving safety. Linear tunnel lighting fixtures should be cut-off type, and special technical measures to eliminate direct and reflected glare should be adopted to form diffuse reflection, so that the light can enter the human eye very softly.

The International Commission on Illumination has used relative threshold increments (TI) to account for the decline in visual function due to glare, a measure of disabling glare. The European Commission for Standardization's tunnel lighting standard specifies the following requirements for incapacitating glare: the relative threshold increment (TI) must be less than 15% in the tunnel threshold segment and inner segment during the day and the entire tunnel at night.

4. Control of linear track lighting fixtures

The advanced lighting control method is an important technique for reasonable energy saving while ensuring the visual conditions and meeting the tunnel lighting requirements. The purpose of the LED linear tunnel lighting control is that the lighting level of the tunnel can be changed at any time. Due to cloudy, rainy or twilight, the brightness outside the tunnel entrance is much lower than usual, so appropriate measures should be taken to reduce the level of lighting at the entrance to reduce unnecessary energy waste. In tunnel lighting, the illuminance of the tunnel lighting environment or the opening and closing of lights can be adjusted and controlled through various dimming devices or control devices according to factors such as day, night, and traffic flow. At present, most of the foreign countries use photosensitive devices, dimmable electronic rectifiers, etc. to form an intelligent lighting system, which reduces the overall brightness of the lamps in the tunnel and reduces the energy consumption; at the same time, the uniformity of the tunnel brightness is kept unchanged.

SHENZHEN LEDMEEN LIGHTING CO., LIMITED is a professional led lighting manufacturer, we provide led circular lighting, recessed tile edge led profile, led extrusion recessed, recessed linear light fittings, led linear lighting system, etc. Want to know led linear light price or more, contact us.