What is the testing standard of a good LED eye protection classroom lamp
With my family’s emphasis on classroom lighting renovation, more and more eye-protecting classroom lights appear on the market, making it a bit difficult to choose. So what should a good LED eye-protecting classroom light look like? What are the testing standards? Let's take a look!
1. Anti-glare: The national standard stipulates that the glare value of classroom lighting is <19, and most school classroom lighting uses simple fluorescent lamp brackets, the light source is directly exposed, the light is very dazzling, and the glare value exceeds 22. As a result, the eye muscles are too tight, which seriously affects students' ability to concentrate in class.
2. Anti-stroboscopic: general fluorescent lamps use AC power, the current changes periodically with time, and 100 flickers per second, resulting in unstable light brightness. When learning under the stroboscopic light source, the visual system needs to constantly adjust the eyeballs. The size of the pupil protects the stability of the retinal light intensity and the clarity of the image. Long-term learning in this light environment will inevitably make the pupil sphincter tired due to overuse.
3. Anti-blue light and other light hazards: The high-frequency and short-wave blue light between 400-500nm in ordinary LED light sources can cause irreversible damage to the eyes, such as the formation of myopia, to the macular disease area that directly penetrates the eyeball to reach the fundus. In addition to the blue light hazards in traditional LEDs, there are seven harmful lights such as actinic ultraviolet, near ultraviolet, retinal heat, weak vision stimulation, small light sources, and infrared radiation. These 7 harmful lights seriously harm our eyes and body to varying degrees.
4. Anti-light decay and prolong service life: After half a year of use, ordinary lamps will have serious light attenuation, resulting in a decrease in luminous flux and thus failing to meet the requirements of national standards. Currently, in order to maintain the lighting brightness that meets the national standards, the cycle of replacing the lamps is 2 to 6 months, and long-term maintenance by relevant maintenance personnel is required, resulting in high maintenance costs and waste of resources.
5. Excellent color rendering index: the spectrum of ordinary fluorescent lamps is incomplete, resulting in color loss and color cast. Far from reaching the national standard Ra≥80, and the poor color reproduction ability of lighting fixtures will directly affect children's color discrimination ability.
6. Comfortable color temperature: The national standard stipulates that the color temperature is 3300-5300K, but the actual measurement result reaches 6500K. Too high color temperature will increase the proportion of blue radiation, and the blue light will also increase. Blue light will be aggravated due to genetics, nutritional environment, healthy habits and old age Related problems caused by macular degeneration. Late self-study for a period of time will also affect the secretion of melatonin in the students, reduce the quality of sleep, and affect the learning efficiency of the next day.
7. Resist the related hazards of fluorescent lamps: fluorescent tubes contain heavy metal substances such as mercury and phosphors. If mercury and heavy metal phosphors are improperly stored and disposed of, they will also cause great harm to the ecological environment. They can enter the ecology in various forms. The environment directly pollutes soil, air and water. Then enter the human body through the food chain, directly endangering human health, and the luminous efficiency of fluorescent lamps is low, generally fluorescent lamps are only 50lm/w. Although the fluorescent lamp emits light at 365 degrees, the light emitted in the opposite direction is basically useless. Although it is reflected back through the lampshade, the reflection efficiency is low and the energy consumption is too high. The ballasts in fluorescent lamps also emit infrasound waves that are harmful to the body.
