The most commonly used light sources in traditional light source signal lights are incandescent lamps and halogen lamps, such as my country's signal light standard GB14887-94
The technical indicators in the Australian standard AS2144 are mainly for incandescent light sources, while the UK and Hong Kong
The BS505 standard previously used by the region was formulated for halogen lamps.
①The advantages of incandescent lamps and halogen lamps are cheap price, simple circuit, and the disadvantage is low light efficiency, reaching a certain level of light output
Ping needs more power, such as incandescent signal lights usually use 220v, 100w bulbs, while halogen lamps usually use 12v, 100w
50w bulb.
②The radiation spectrum of LED Solar Road Studs light is narrow band, good monochromaticity, without filter, and the light emitted by its light source can basically be used, while traditional light source signal lights need to use filters to get the required color, resulting in light The utilization rate of the signal lamp is greatly reduced, so the intensity of the signal light emitted by the final signal lamp as a whole is not high. And use color film and reflective cup as optical system
The traditional light source of traffic lights, the reflection of external interference light (such as sunlight or car lights) will give people an illusion
, Mistaking the non-working signal light for the working state, that is, "false display", which may lead to accidents.
③Incandescent lamps and halogen lamps have a short service life, and there is trouble in replacing bulbs, requiring a large amount of funds for maintenance;
④Compared with incandescent lamps, LED traffic Solar Road Studs lamps have a longer service life, generally up to 10 years. Considering the impact of the harsh outdoor environment, the expected service life will be reduced to 5-6 years. At present, ultra-high-brightness red, yellow, and green LEDs have been industrialized, and the price is relatively cheap. If the module composed of red ultra-high-brightness LEDs is used to replace the traditional red incandescent traffic signal lamp holder, the safety hazard caused by the sudden failure of the red incandescent lamp can be reduced. impact is reduced to a minimum. Generally, the LED traffic signal module is composed of several groups of LED single lights connected in series. Taking the red LED traffic signal module with a diameter of 300mm as an example, in 3~9 groups of LED single lights connected in series, the number of LED single lights in each group is 70~75 (a total of 210~675 LED single lamps), when one LED single lamp fails, only one group of signals will be affected, and the remaining groups will be reduced to 2/3 (67%) or 8/9 (89% of the original) %), and does not invalidate the entire signal lamp head like an incandescent lamp.
⑤ Infrared rays account for a relatively high proportion of the light radiation of incandescent lamps and halogen lamps, and the thermal effect produced will affect the production of high-quality lamps.
Molecular materials make an impact.
⑥Because the LED road traffic Solar Road Studs lights are composed of multiple LED illuminants, the design of the pattern lights can be adjusted by adjusting the layout of the LEDs to form a variety of patterns, and various colors can be made Integrate various signals into one body, so that the same light body space can be given more traffic information, configure more traffic schemes, and can also form dynamic pattern signals by switching LEDs in different parts of the pattern, so that dull traffic signal
It is more humane and more vivid, which is difficult for traditional light sources to realize.
⑦The current main problem of LED traffic signal module is that the cost is relatively high, but due to its long service life and efficiency
Other advantages such as high rate, the overall cost performance is very high.
