I don't know if parents have noticed the question: Under what conditions does your child read every day? Generally speaking, the light emitted by ordinary light bulbs is obviously reddish instead of white light compared with natural light, because such light will be The contrast between the black and white of the object is reduced, and the resolution of the human eye is reduced. Therefore, in order to see the font on the book, the eyes must be close. At the same time, since the light bulb is a point light source, it is easy to produce glare and large-area shadows that are very harmful to vision. When reading in this light for a long time, the eyes will feel tired. Although the light emitted by ordinary fluorescent lamps is white, since it is directly illuminated by 50 Hz AC, the brightness of the fluorescent lamps will change continuously at a frequency of 100 times per second. This is the stroboscopic phenomenon of fluorescent lamps. We all know that movies and TV have strobes of 50 times per second, and you will feel tired when you watch your eyes for a long time. By the same token, when you study under the fluorescent lights for a long time, your eyes will feel tired. The latest research shows that only using a reading light source that is not easy to cause eye fatigue is the key to solving myopia problems in children. At present, there are various styles of eye protection lamps, such as Philips, Panasonic, Jiasheng, Fu Neng, Mingda, Jianshi and many other brands, the price ranges from 100 yuan to 500 yuan. These new eye-protection lamps are non-frequency flash fluorescent lamps developed from the illumination source of color liquid crystal displays. It can emit white light with stable brightness, no flicker and very similar to natural light, which overcomes the weakness of traditional light source and meets the requirements of primary and secondary school students reading under the lamp for a long time. It has obvious effects on slowing down visual fatigue and preventing the occurrence and development of myopia. It is an ideal light source. Comparison of characteristics â—†The general lamp uses 220v, 50Hz AC, and produces 100 strobes per second, which is unfavorable to the eyes, which can easily cause eye fatigue and lead to myopia. â—†The desk lamp with eye protection function will process 220v and 50Hz AC signals, so that the lamp can emit brightness with no stroboscopic light, which can eliminate eye fatigue, prevent myopia and protect eyesight. â—†The general lamp emits 6500K color temperature cold white light or 2700K color temperature red light, which are all defective light sources that are unfavorable to the eyes. â—†The table lamp with eye protection function emits white light similar to natural light, which helps to protect eyesight.
Field fence also called Hinge Joint Fence grassland garden mesh(Grassland Fence).
Field Fence is commonly made for hot dip galvanized Wire , the rate of zinc is generally 40-50g/m2, wet regions are higher, using around 230g/m2. Some contries like Africa use the elctric galvanized wire instead.
Usully the horizontal wire using steel wire to increase the mesh impact resistance.
Filed fence specification:
1. top and bottom wire diameter: 2.5mm
2. inner wire diameter: 2.0mm
3. the common size: 7/150/813/50, 8/150/813/50, 8/150/902/50, 8/150/1016/50, 8/150/1143/50, 9/150/991/50, 9/150/1245/50, 10/150/1194/50, 10/150/1334/50, 11/150/1422/50 (The first data is the No. of line wire: The second data is horzontal hole size: The third data is the height of field fence: The fourth data is the total length of each roll)
Field fence Farm Fence,Hinge Joint Fence,Galvanized Field Fence,Grassland Fence Anping Deming Metal Net Co.,Ltd , https://www.wovenfence.nl
What should I pay attention to in the selection of children's room lamps?