Light meter and healthy living instructions
Illumination is closely related to people's lives. Sufficient light can prevent people from accidents. Conversely, too dark light can cause human fatigue far more than the eyes themselves. Uncomfortable or poor lighting conditions are therefore one of the leading causes of accidents and fatigue. Existing statistics show that about 30% of all occupational labor accidents are directly or indirectly caused by insufficient light. The lighting of the stadium (stadium) must be very strict. If the lighting is too strong or too dark, it will affect the effect of the game.
So, what about the hygiene of the indoor contrast illumination where people live? Illuminance is a very important indicator in hygiene. Light refers to the electromagnetic radiation that can cause the human eye to feel bright. When the light enters the eye, the perception that can be produced is called vision. The light that people see refers to visible light, and its wavelength range is between 380nm and 760nm (nanometer).
At present, lighting can be divided into two categories: natural lighting and artificial lighting. Natural lighting refers to the natural illuminance of indoor and regional areas, including direct sunlight scattered light and reflected light from surrounding objects, and is often expressed by daylighting coefficient and natural illuminance. The daylighting factor refers to the ratio of the effective area of the daylight opening to the indoor floor area. The daylight factor of a general residence is between 1/5 and 1/15, and the living area ratio is between 1/8 and 1/10 (window area/indoor floor area). The natural illuminance coefficient is used to evaluate the illuminance level of natural light. It reflects the relationship between indoor and outdoor light exposure. It also reflects the local light climate (the sum of the natural light energy and the sunlight illuminance index of the climate).
In order to ensure that people live under suitable light, our country has formulated health standards for indoor (including public places) illumination. For example, the sanitary standard of illuminance in shopping malls (stores) in public places is ≥100Lx; the sanitary standard of illuminance on countertops in libraries, museums, art galleries, and exhibition halls is ≥100Lx; the sanitary standard of illuminance in public bathrooms is ≥50Lx; The illumination requirements for visual work on the production line are 1000Lx; hotels and public rooms are 200Lx; reception points and cashiers are 200Lx; shop windows are 1500-2000Lx; hospital wards are 150-200Lx, emergency areas are 500Lx; schools and classrooms are 400-700Lx; canteens and indoor gyms are 300Lx, etc.
For the measurement method of illuminance, it is generally measured with an illuminance meter. The illuminance meter can measure the intensity of different wavelengths (such as the measurement of visible light band and ultraviolet band), and can provide people with accurate measurement results.
In short, illumination and human health, especially eye care, have extremely important hygienic significance.
