According to Organic Green Roots: ‘photoluminescent Core Glow pebbles provide an interesting, almost ethereal feature to outdoor design. When the eco-friendly pebbles are exposed to light sources, (solar or otherwise) the special light capturing pigment within them becomes chemically excited and will ‘glow’ once that light source is removed. The luminescent material is a multi-activated, highly efficient powder cultivated from the earth, that enables light-storing with a long afterglow.
When added to a concrete driveway and exposed to the sun, the pebbles will store enough energy to illuminate a dark pathway all night long, initially very radiant, then slowly dissipating as dawn arrives. With only 10-20 minutes of exposure to daylight or lamplight, the pebbles can maintain their afterglow for about 10-12 hours.
The CORE Glow pebbles are non-radioactive, non-toxic and environmentally friendly. They can be implemented in a variety of landscaping, custom concrete or masonry needs. The material is a inert long lasting recyclable plastic but are also available in a recycled glass. Both last an average of 20 years.
So what makes them glow? A chemical element called Strontium aluminate; and an activator, Europium is added – this causes a chemical reaction, creating the glow. The material is biologically and chemically inert, so completely safe for home use.
These pebbles are primarily an esthetic element that can add a new layer to hardscape designs but certain applications will help to greatly reduce pathway lighting costs. Since the CORE Glow products require no electricity, no power supply and no batteries they saves natural resources and offer an alternative to traditional pathway lighting.’