Applications of Illuminance Meters in Our Daily Lives
Illumination is closely related to our lives. Adequate lighting can prevent people from accidents. On the contrary, excessively dim light can cause fatigue in the human body to a much greater extent than the eyes themselves. Therefore, uncomfortable or poor lighting conditions are one of the main causes of accidents and fatigue. Existing statistical data shows that about 30% of accidents in all occupational labor are directly or indirectly caused by insufficient lighting. The lighting of sports venues must be very strict, as excessive or insufficient lighting can affect the effectiveness of the game.
So, what is the hygiene of indoor lighting for people living in? Illumination is a very important indicator in hygiene. Light refers to electromagnetic radiation that can cause a sense of brightness in the eyes, and the perception that can be produced when light enters the eyes is called vision. The light that people see refers to visible light, with a wavelength range between 380-760nm (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, which includes direct sunlight, scattered light, and reflected light from surrounding objects. It is commonly represented by the lighting coefficient and natural illumination. The daylighting coefficient refers to the ratio of the effective area of the light collection port to the indoor floor area. The daylighting coefficient of general residential buildings 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 external light irradiation simultaneously. It also reflects the local light climate (the sum of natural light energy and sunlight intensity indicators of the climate).
In order to ensure that people live under suitable lighting conditions, China has formulated hygiene standards for indoor (including public places) illumination. The lighting hygiene standard for public places such as shopping malls (shops) is ≥ 100Lx; the lighting hygiene standard for countertops in libraries, museums, art galleries, and exhibition halls is ≥ 100Lx; the lighting hygiene standard for public bathrooms is ≥ 50Lx; the lighting hygiene standard for bathrooms (showers, pools, and baths) is ≥ 30Lx, and the sauna bathroom is ≥ 30Lx. Regarding indoor lighting standards abroad, Germany recommends several rated light intensities, with offices including document work areas being 300Lx, typing and drawing work being 750Lx; the lighting requirement for visual work on factories and production lines is 1000Lx; hotels and public rooms are 200Lx; reception points and cash counters are 200Lx; shop windows are 1500-2000Lx; hospital wards are 150-200Lx, emergency * * area 500Lx; schools and classrooms 400-700Lx; canteens and indoor gyms 300Lx, etc.
For the measurement method of illuminance, an illuminance meter is generally used. Illuminometer can measure the intensity of different wavelengths (such as visible light and ultraviolet light), providing accurate measurement results to people.
