The blue light emitted by any device can interfere with our biological clock. When we use artificial lighting for a long time, the blue light emitted by fluorescent and LED lights can reduce melatonin levels. One way to solve this problem is to use anti blue light film to reduce screen blue light.

Science has shown that blue light emitted by computer screens (and other energy-saving light sources) is a common cause of visual stress. Solution: Filter blue light. But how to choose an anti blue light film. The main method for comparing anti blue light films is based on their spectral transmission/transmittance. By telling you the percentage of light with different wavelengths passing through the filter, it describes the transmission characteristics of the filter. Spectral transmission can be given in a table, which usually has two columns. The first column contains wavelength data in nanometers (nm), and the second column contains% transmittance. Usually, only visible light wavelength data is displayed, ranging from~380nm to~750nm.

How to view the spectrum of the anti blue light film:

The spectral transmission curve describes the proportion of each wavelength of light that the filter allows to pass through (transmittance%) and the proportion of blocking (transmittance 100% -%). The blue light filter should be compared throughout the entire visible spectrum range, especially within the interval of 400-500nm, which is considered as the blue light wavelength. In short, filters with lower curves at 400-500nm transmit less blue light, or in other words, block more blue light.

The reason why anti blue light film can effectively reduce screen blue light mainly depends on the color and darkness of the filter (in some cases, it is a blue blocking coating or certain materials inside the lens). A red filter may block all light except for red, so blue will be completely blocked. However, their overall visible light transmittance is low and there is significant color distortion. Yellow filters often block less blue light, but provide higher visible light transmittance and lower color distortion. The amber/orange filter falls between the two.