The desk lamp is a household necessity. A good desk lamp is very important for children's study and health. In order to better improve children's visual environment when reading and writing, and help consumers choose appropriate reading and writing lamps, the China Consumer Association, together with Jiangsu, Zhejiang Consumer Protection Commission and Zhejiang Taizhou Consumer Protection Commission, has recently carried out a comparative test of reading and writing lamps.
Among the 73 samples, the electric shock protection and blue light test items of all samples meet the safety requirements. The marks of 19 samples are incomplete, and 9 sample structures have potential safety hazards. The illumination of 45 samples is too low or the uniformity of illumination is poor, which will affect the clarity and comfort of the lighting and easily cause visual fatigue.
Experts said that illuminance refers to the luminous flux projected on the unit area. Adequate and uniform illuminance can ensure that the eyes have a good recognition of reading and writing operations. Low illuminance will affect the clarity and comfort of lighting and affect eye health.
Another important indicator to measure the quality of desk lamp is the color rendering index, that is, the degree of conformity between the object color under the measured light source and the object color under the reference standard light source. The higher the color rendering index, the closer the object color is to the color under the sun. For example, if the color rendering index of sunlight is defined as 100, the color rendering index of incandescent lamp is very close to 100, so it is regarded as an ideal reference light source, and the color rendering index of general light source should not be less than 80. In this comparative test, the general color rendering index of 9 samples is lower than 80, which may not display the color of objects correctly, causing color distortion, easy to form visual fatigue and damage vision.
In addition, the color temperature is an important indicator for detecting the illumination of the desk lamp. Warm color light means low color temperature, with more red components and less blue components. On the contrary, the color temperature of cold blue light is higher. Generally, the light with a color temperature of about 4000K is soft and yellow, which is suitable for reading. This test found that 24 samples had a color temperature higher than 4000K, which was quite dazzling.
Experts from the China Consumer Association suggest that you should choose products with complete logos when buying table lamps. The light source type, general color rendering index, color temperature, manufacturer, production address, etc. required by the product shall be marked on the reading and writing desk lamp itself, package and instructions. Do not buy products without important parameters.
(Reporter Qi Zhiming)
