Luminous products have a relatively good absorption effect on ultraviolet rays. They absorb light during the day and emit light in dark places, and the cycle is repeated. The intensity of the light and the length of time are different, and the brightness of the night light will also be different. After about 30 minutes of exposure, it can emit a few hours of afterglow.
When there is no ultraviolet sunlight at night, you can put it under the light to absorb light,
There is no need to deliberately bask in the sun, as long as you touch the light source, it will start to shine in the dark.