The effect of afterglow lighting is that of “phosphorescence”. This is often is confused with “fluorescence”. This term was named based on the element of “phosphorous”, which has a natural afterglow observed by the alchemists in the 17th century and so named. The element phosphorous is not used in phosphorescence nowadays. With phosphorescence, the luminescent materials charge themselves in UV- or black light and then illuminate in the dark. In public this effect is often called “glow in the dark”. Our luminescent materials do not contain any phosphorous either.