exit sign

Recently I have found out that some common things that we may not notice before can turn out to be something very interesting if you make a further research on them. If you have some doubts about it, I can set you an example. This is exactly the thing that enables me to have such an idea. The thing I discovered is exit signs. You must have seen it in many occasions before. But if I ask you how many kinds of exit signs there are altogether and what is the differences between them, you may not give the correct answer soon. Then let me explain. As far as I know, there are 7 different kinds of exit signs for different occasions. Aspen Red Photoluminescent Exit Sign is the commonest exit sign we can see. It is widely used in public occasions as a sign for life-escaping in emergencies. LED and LEC Exit Signs are based on LED and LEC technologies and they can be used indoors to shine for a relatively long time. There is another kind of LED exit signs for outdoor use. Tritium exit sign is based on chemistry technology. The last two exit signs are called Aspen B and Aspen G, which are not common to be seen. That’s all I know about the exit signs. If you know more than or I have some wrong ideas, you are welcomed to teach me. Life needs discovering. Be active to life, and enjoy the hidden pleasure of life. I will be very pleased if you tell me your discoveries.