Gravels Glow In the Dark for Walkway

"Line a pathway with rocks(decorative gravels) painted in glow luminous paint. During the day they“charge" in the sun and in the evening they reflect the stored light."This is another example of a photo on pinterest with an idea that doesn't match up with the image. Those are not patio stones that are painted with glow in the dark paint. I've also seen the same image tagged with Glow Stones - a company that makes glow in the dark rocks.