Photoluminescent powder, also known as pigment, is a non-toxic, non-radioactive new environmentally friendly alkaline earth aluminate pigment. Most of the visible or UV light will charge the pigment particles (excitation). The photo luminescent pigment then releases energy for 10 to 24 hours in the form of visible light (which glows in the dark). The photographic light-emitting pigments provide duty-cycle operation with a very high ratio of glow time to the desired charging time. Luminous intensity (brightness) and afterglow time than the traditional ZnS (zinc sulfide) or usually sold retail store products more than 30 times higher.
How bright are these glow products?
Many photoluminescent pigments and products manufacturers refer to the extinction time of their products, which is defined as the time required for afterglow to be reduced to 1 masb (0.032 mcd / m2, or about 100 times the human perception limit). In practice, it is very difficult, unless your eyes are completely dark to adapt, and you are in a completely dark environment.
For practical purposes, the brightness of one to two millimeters per square meter is a more appropriate limit for life safety applications, even if a smoke-free environment is assumed. Therefore, the zinc sulfide product may take 30 to 45 minutes after its excitation source is extinguished. On the other hand, the afterglow of strontium aluminate products can be seen for days or even longer. All PhotoLuminescent Powder are based on strontium aluminate.
At the other end of the time scale, strontium aluminate products can provide surprising initial afterglow. For example, four inches of square material from the magazine page can provide enough light, at least in the first minute. In addition, the microprism retroreflector and other brightness enhancement techniques can increase the brightness of the material several times.
