Is the illuminance meter useful?
The lives of people are directly tied to illumination. Having enough light can help people avoid accidents. In contrast, too little light might make people feel tired more than the eyes themselves. Therefore, one of the main factors contributing to accidents and weariness is uncomfortable or inadequate lighting. According to data currently available, inadequate lighting is either a direct or indirect cause of around 30% of all occupational work accidents. The lighting regulations for stadiums are highly rigorous; a game will be impacted by too much or too little light.
What then are the hygienic requirements for the contrast lighting inside homes? A crucial indicator in hygiene is illumination. Light is the term used to describe electromagnetic radiation, which can appear brilliant to the human eye. Vision is the perception that can result from light entering the eye. The visible light that humans perceive has a wavelength range of 380 to 760 nm (nanometers).
Currently, there are two types of lighting: natural lighting and artificial lighting. Natural lighting is commonly characterized as daylighting coefficient and natural illuminance, and it relates to the natural illuminance of interior and regional spaces, including light scattered by direct sunlight and light reflected from nearby objects. The effective area of the daylight opening divided by the total area of the interior floor is known as the daylighting factor. A typical home has a living area ratio of between 1/8 and 1/10 (window area/indoor floor area), and its daylight factor ranges from 1/5 to 1/15. The amount of illuminance provided by natural light is measured using the natural illuminance coefficient. It illustrates the link between exposure to indoor and outdoor light.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; bathrooms (showers, pools, bathtubs)≥ 30Lx, sauna ≥ 30Lx. Foreign standards for indoor illuminance, such as Germany recommends several rated light intensity, the office includes 300Lx for clerical work, 750Lx for typing and drawing work; the illuminance requirements for visual work on the factory and production line are 1000Lx; 200Lx for hotels and public rooms; 200Lx for reception points and cashiers; 1500-2000Lx for shop windows; 150-200Lx for hospital wards, 500Lx for emergency treatment areas; 400-700Lx for schools and classrooms; canteens and indoor gyms For 300Lx etc.
Illuminance is often measured with an illuminance meter for this measurement type. The illuminance meter can accurately measure the intensity of several wavelengths (for example, the measurement of the visible light band and the UV band).
In short, lighting and human health, particularly eye care, have huge sanitary implications. For schools and classrooms, use 400–700Lx; for canteens and indoor gyms, 300Lx, etc.
