Glow in the dark powder is a material that can emit light automatically in the darkness. It is also known as luminous powder. Some customers may ask why the luminous powder they buys is not that bright in the dark. Actually, glow in the dark powder is like normal lamps. Some of them are brighter and some are not that bright. There are many factors that determine the brightness of glow in the dark powder. For example, it can be light absorption time, powder purity, formula ratio, the particle size of the powder, etc. The particle size and light source are two decisive factors of the brightness of luminous powder. Today, let Juliang tell you everything about their relationship.lso known as luminous powder. Some customers may ask why the luminous powder they buys is not that bright in the dark. Actually, glow in the dark powder is like normal lamps. Some of them are brighter and