The applications of light meters in our daily lives
Illumination is closely related to our lives. Adequate lighting can prevent people from accidents. On the contrary, too dark light can cause fatigue to the human body far beyond the eyes themselves. Therefore, uncomfortable or poor lighting conditions are one of the main causes of accidents and fatigue. Existing statistics show that about 30% of all occupational labor accidents are caused directly or indirectly by insufficient light. The lighting requirements for stadiums (venues) are very strict. Too strong or too dark light will affect the effect of the game.
So, what is the hygiene of the indoor contrast where people live? Illumination is a very important indicator in hygiene. Light refers to electromagnetic radiation that can cause the feeling of light in human eyes. The perception that can be produced when light enters the eyes is called vision. The light that people see refers to visible light, whose wavelength range is between 380 and 760nm (nanometers).
At present, lighting can be divided into two categories: natural lighting and artificial light sources. Natural lighting refers to the natural illumination of indoor and regional areas, including direct sunlight, scattered light and reflected light from surrounding objects. It is commonly expressed by lighting coefficient and natural illumination. The lighting coefficient refers to the ratio of the effective area of the lighting opening to the indoor floor area. The lighting coefficient of general residences 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 illumination coefficient is used to evaluate the illumination level of natural light. It reflects the relationship between indoor and outdoor light irradiation at the same time. It also reflects the local light climate (the sum of natural light energy and climate sunlight illumination indicators).
In order to ensure that people live under suitable light, our country has formulated health standards related to indoor (including public places) illumination. For example, the hygiene standard of illumination in shopping malls (stores) in public places is ≥100Lx; the hygiene standard of countertop illumination in libraries, museums, art galleries, and exhibition halls is ≥100Lx; the hygiene standard of illumination in public bathrooms is ≥50Lx; bathrooms (showers, pools, and bathtubs) ≥ 30Lx, sauna ≥30Lx. Foreign standards for indoor illumination, such as Germany recommends several rated light intensities, offices including paperwork areas are 300Lx, typing and drawing work are 750Lx; in factories, the illumination requirements for visual work on the production line are 1000Lx; hotels and public rooms are 200Lx; reception points and cashiers are 200Lx; store windows are 1500~2000Lx; hospital wards are 150~200Lx, emergency escape areas are 500Lx; schools and classrooms are 400~700Lx; canteens and indoors Gym is 300Lx etc.
For the measurement method of illumination, a light meter is generally used. The illuminance meter can measure the intensity of different wavelengths (such as the measurement of visible light bands and ultraviolet bands) and can provide people with accurate measurement results.
In short, illumination has extremely important hygienic significance with human health, especially eye care. Equipped with the correct indoor light source and maintaining good living habits, you can have a pair of bright and healthy eyes, which is your lifelong happiness.
