Yes, lighted exit signs can be used outdoors, but they must be specifically designed and rated for outdoor use. Outdoor exit signs need to be weatherproof and able to withstand various environmental conditions such as rain, wind, temperature fluctuations, and UV exposure. They should have an appropriate Ingress Protection (IP) rating, typically IP65 or higher, to ensure they are protected against dust and water ingress. Additionally, outdoor exit signs should be made of durable materials like polycarbonate or aluminum to resist corrosion and physical damage.
These signs often come with features such as LED lighting for energy efficiency and long life, battery backup systems to ensure visibility during power outages, and high visibility lettering and symbols to comply with safety regulations. It's important to check local building codes and standards, such as those from the National Fire Protection Association (NFPA) or the International Building Code (IBC), to ensure compliance with specific requirements for outdoor exit signage.
In summary, while standard indoor exit signs are not suitable for outdoor use, there are specially designed outdoor exit signs available that meet the necessary durability and safety standards for external environments.