Warm tips:
The darker the surrounding and the more exposure to visible light, the more bright glow can be seen.
When applying these glow pebbles, do not stack them on top of each other but spread them out flat for full exposure to light.
These glow in the dark pebbles are light up by solar or LED light.
How much sunlight do these need per day to light up every night?
two - three hours. They'll still glow even when the sun isn't strong.