SignLab's photoluminescent product is much more brighter for longer than usual PSPA Class A product found in safety signage and is suitable for exterior use. We have improve its appearance under usual lighting conditions yet still glow brighter when light source is removed. Material wise is extremely durable - resistant to shrinkage and curl, also the low profile thinner material is less prone to attention from vandals. Please consult with our technical team for more information.