Health comfort evaluation method of LED lighting products

Review: LED lighting is also gradually get rid of the blue light hazard questioned, open the scale of the lighting market. People's attention to the "safety" of LED lighting is shifting to "healthy and comfortable". What kind of lighting is healthy and comfortable? How to evaluate the health and comfort of lighting is a matter of concern.

Cai Jianqi said, with the continuous development of lighting technology, the quality of human light requirements have been viewed from the clear and vivid, safe development of health requirements now. Because of the human eye than any equipment now is more complex, using the method of photometry and colorimetry were used to evaluate the quality of the light can make the eye view and guarding the reduction state. With the progress of technology, including photometry, colorimetry, optometry, ophthalmology, the development of modern medicine and biomedicine, the emergence of the "vision to effectively evaluate the quality of light for learning".

Visual ergonomics to improve product health attributes as the goal, the people for health design, using a large sample of ergonomics test data, objective and quantitative effects on people's perception of product function, the research and development, so as to guide the improvement of products, compared with the traditional methods of health evaluation index of comfort can be effective quantitative.

Cai Jianqi believes that the effects of light on health can be divided into the impact of visual function and visual perception. The influence of visual energy, including visual fatigue, eye function, and so on.

Based on the evaluation of visual optics and subjective cognition, Cai Jianqi put forward one of the indicators to evaluate the effect of light on human health: MAR index.

The MAR index is divided into 5 levels, namely:

0-1 level, the human eye will not have a sense of fatigue;

1-2 class has a slight sense of fatigue;

2-3.5 class has obvious visual fatigue, but also can tolerate;

3.5-4 class visual fatigue, and accompanied by a series of symptoms;

4-5 level, the visual fatigue is very strong, should immediately stop the activities in the light environment.

Measurement of the MAR index will need visual transfer function, the human eye refraction ratio, gathered many index data through the neural network not need sample quantity in order to achieve great. Mr. Cai Jianqi describes the process of evaluating the lighting products based on the optical method, as shown in the following figure. After the preliminary study and large sample measurements, the Cai Jianqi team has completed the construction of the color temperature and the apparent index, stroboscopic, illuminance threshold visual evaluation model.

Mr Cai Jianqi said that his team has put forward proposals on the results of these studies, in order to provide guidance on the health and comfort of lighting products.