luminous paint source is weak, to observe in the dark, the darker, the better the effect of the performance.
Luminous effect refers to the luminance and afterglow time is proportional to both.
Energy mobile phone battery when the call is released in us, luminous edge absorption edge is released, there is no "switch" to control. Luminous light absorption, it is also light, but the surrounding is too bright, we can not see it. It was getting dark, luminous energy external light source to the increasingly weak, self-luminous energy due to the continuous release of fewer and fewer days when completely dark, luminous brightness has been very faint. If at this time to give the luminous light, will have better performance. That is, we often ask the "long-lasting garden decorative stones can emit light more than a dozen hours, why not after dark on?" Reasons.