Luminescent pigment luminous brightness and visibility

We often have this experience at the cinema, from the bright outside suddenly into a dark room will not see anything, you can see when your eyes adjust to the darkness of the surrounding objects . Glow in the dark pebble may have optic nerve from the eye to bright light and darkness to light two different neural systems are explained . This is also called the eye of the dark adaptation.
Brightness luminescent pigment belongs to a weak light , even in the same light conditions , also due to the adaptability of the dark eyes and a considerable visual difference . Moreover, the visual is also affected by external light , the darker the surrounding The higher visibility brightness , visibility longer .
Typically, the sound can be seen to the naked eye brightness of 0.01mcd/m2, but brightness is not unconditional can glow in the dark sand and visibility of its time visibility on dark adaptation by the eye , outside light , shape, size , distance restrictions.
Phosphorescent pigment of the special light stability of the treatment , but also due to long-term use in outdoor combined action of humidity, temperature , ultraviolet light and dark .