When LEDs are recognized as the best light source in the future, the industry has frequently exposed the problem of LED light damage. As a new type of light source, LED lighting has achieved rapid development in technology and application in recent years. At the same time, the safety of LED light sources for human health has also received more and more attention. As a carrier of healthy lighting, LED will be more widely used in our lives. How to determine the safety of LEDs in different applications? Is there a quantitative standard for LED health lighting? How to use healthy lighting The research and development results are truly integrated with the market, and scientifically guide enterprises to develop safer and healthier LED lighting products. These kinds of problems have caused the industry to ponder.
Be alert to the danger of LED glare on the human body
On a clear night, you can see the Milky Way by looking up, and the stars are twinkling, so that people who have lived in the city for a long time and are familiar with the five-color lights have a shock to the soul. This situation may no longer exist in some big cities. The excessive use of lighting systems by humans has created many problems. The most obvious effect is that the stars in the city's night sky are covered by the lights of many buildings and disappear. This has affected the study of the universe, the destruction of the ecological balance, and the impaired human health.
In recent years, the development of LED lighting has presented a scene of enthusiasm. Like other light sources, the optical radiation of LEDs can theoretically cause harm to the human body. The damage mainly occurs in the eyes and skin of the human being, such as photochemical hazards of the skin and eyes, near-ultraviolet hazards of the eyes, retinal photochemical hazards of the retina, photochemical hazards of the retina, retinal heat hazards and skin heat hazards, among others. It is the eyes that are vulnerable. In addition, LEDs can also cause glare damage. Glare is one of the most important factors in evaluating the quality of illumination due to the unfavorable distribution or range of brightness in the field of view, or extreme brightness contrast in space or time, resulting in discomfort and reduced visual visibility of objects. .
Glare is common in light radiation that causes light pollution. Glare refers to the unsuitable brightness range in the field of view, the extreme brightness contrast in space or time, which causes visual phenomena that are uncomfortable or reduce visibility. The light pollution of the glass curtain wall is due to its reflection of sunlight, light, etc. Excessive light causes glare. Glare causes people's vision to drop and fatigue quickly. There are many glare pollutions in daily life. For example, the glare of car headlights coming on at night will reduce the control of drivers and pedestrians who are stimulated by light, and it is easy to be dangerous.
Radiation hazards have been listed by the World Health Organization as the fourth largest environmental safety issue facing humans beyond “air, water, and noiseâ€. Optical radiation is an important part of radiation, and its ultraviolet radiation and blue light radiation are particularly harmful to the human body. In recent years, with the development of LED technology , the radiance of LED chips has been greatly improved, the light beam has become narrower, and the wide application of LED ultraviolet and blue-band chips has made LED light radiation hazard a problem that cannot be ignored. . LED light radiation hazards are mainly reflected in the near-ultraviolet radiation damage of the eye, the photochemical damage of the retinal blue light and the thermal damage of the radiation.
Doorbell speaker:
Doorbell speaker is a kind of micro speaker unit which uses a diaphragm made of Mylar material. Doorbell speakers are of ultrathin design and lightweight and clear voice. It is widely used in building security industry (e.g. intercom, video door phone, intelligent door control..)
There are two types of Mylar speakers from the shapes:
1) Round shapes, we have products from 10mm to 57mm in diameter.
2) Oblong shape, we have products in sizes of 1510/1712/1813-..
FAQ
Q1. What is the MOQ?
XDEC: 2000pcs for one model.
Q2. What is the delivery lead time?
XDEC: 15 days for normal orders, 10 days for urgent orders.
Q3. What are the payment methods?
XDEC: T/T, PayPal, Western Union, Money Gram.
Q4. Can you offer samples for testing?
XDEC: Yes, we offer free samples.
Q5. How soon can you send samples?
XDEC: We can send samples in 3-5 days.
Doorbell Speaker,Doorphone Speaker,Video Doorphone Speaker,Doorbell Wireless Speakers
Shenzhen Xuanda Electronics Co., Ltd. , https://www.xdecspeaker.com