So here’s a mosaic glass tile that not only looks great during the day – it also looks pretty cool with the lights out. Fireglass glass mosaic tiles glow in the dark! Just leave in the light a few minutes, turn off the lights and watch them glow. A truly different look as a décor or even safety feature for pools, spas, fountains, and other outdoor applications. There are a variety of designs to choose from in this radiating glass tile collection. Glowing customer review: Love this tile! Glows great and will work awesome in some of my craft.