Bilingual, Photoluminescent Tornado Shelter Sign
Details
Our safety-grade photoluminescent signs (glow in the dark) are made from materials that are inert, waterproof, non-toxic, non-radioactive and can be charged over and over again. A full charge of 8 or more hours of luminance on DHi's AfterGlow® photoluminescent Tornado Shelter sign is achieved by exposing the photoluminescent material to:
- 3-4 minutes of ultraviolet (black) light, or
- 7-8 minutes of direct sunlight, or
- 21-23 minutes of fluorescent light, or
- 24-26 minutes of incandescent light.