Definition and Importance
Light uniformity refers to the uniform distribution of light emitted by a table lamp in its irradiation area. It is one of the important indicators for measuring the lighting quality of a table lamp and is essential for protecting eyes and providing a comfortable visual environment. If the lighting is uneven, it may cause light spots with large differences in brightness in the reading or working area, causing the eyes to frequently switch between different brightness areas, which is prone to visual fatigue and may also cause damage to vision after long-term use.
Measurement method
Measuring the illumination uniformity of a table lamp usually requires the use of professional photometric measurement equipment, such as a distribution photometer. When measuring, place the table lamp in a specified position and turn it on, set multiple measurement points on its irradiation plane according to a certain grid distribution, and then use a photometer to measure the illuminance value of each point in turn. Generally speaking, the denser the distribution of the measurement points, the more accurately the results can reflect the illumination uniformity. By analyzing and calculating the illuminance values of these measurement points, the relevant data of illumination uniformity are obtained.
Quantitative indicators
Common quantitative indicators for measuring illumination uniformity include the ratio of minimum illumination to average illumination, illumination uniformity coefficient, etc. The ratio of minimum illumination to average illumination refers to the ratio of the minimum illumination value to the average illumination value in the measurement area. The closer this ratio is to 1, the better the illumination uniformity. The illumination uniformity coefficient is a value obtained by a specific calculation formula, taking into account factors such as the maximum, minimum and average illumination values in the measurement area. Similarly, the closer this coefficient is to 1, the more uniform the illumination distribution in the area.
Considerations in practical applications
In practical applications, different usage scenarios have different requirements for the illumination uniformity of Table Lamp. For example, when reading and writing, Table Lamp is required to provide relatively uniform illumination in the effective working area of the desktop. Generally, the illumination uniformity coefficient is required to reach 0.7 or above to ensure that the brightness of the entire reading or writing area is consistent and reduce eye fatigue. For some environmental lighting scenarios with relatively low requirements for illumination uniformity, such as auxiliary lighting in the bedroom, the illumination uniformity requirements are relatively loose, but the rationality of light distribution should be ensured as much as possible to avoid obvious light and dark contrast.
