➤ The Unit of Brightness of Luminous powder

 

➤ Store the Light energy to glow

Luminous powder is a process that needs to store the surrounding light first, and then release the light when there is no light in the surrounding environment. Therefore, if you want the luminous powder to glow in the dark, you first need an excitation light source to illuminate the luminous powder. a period of time.

➤ The brightness attenuation characteristic of luminous powder

Within one hour after the excitation light source stops irradiating, it presents a cliff-like attenuation. The brightness is only 100-500mcd/㎡ after 10 minutes, and 10-100mcd/㎡ after one hour, which is only 1% of the original brightness. At this time, if it is not observed in a completely dark room, it is difficult to see the luminous powder glowing (for specific luminous parameters, please refer to the Aeso model table).

Actually not, after an hour of rapid decay of the brightness of the luminous powder, the decay speed begins to slow down greatly. 

After 8 to 10 hours, the luminous brightness can generally be maintained at 3 to 9mcd/㎡. The weakest light that the human eye can observe in total darkness is 0.33mcd/㎡, and it usually takes more than 10,000 minutes for the brightness of luminous powder to decay below this value.

This means that the luminous powder can continue to emit light for 10,000 minutes (more than 166 hours) after the excitation light source stops irradiating.

➤ Long afterglow luminous powder

-green can even glow for more than 12 hours. 

➤Which parameters to read in catalog?

Now in order to accurately express and popularize the application of testing instruments, it can be seen that in the parameter tables of most manufacturers, Brightness (mcd/㎡) is gradually divided into two dimensions: 10min and 1 hour.