These stones themselves cannot emit light. But these pebbles absorb enough sunlight during the day and can glow for 2-3 hours at night or in any other dark environment. If they are not bright enough, please shine light on them again. Quantity: 50 pieces Size: 2-3cm/0.78-1.18 inches Color: mixed/white/green/yellow/rose red/blue Material: luminescent pigment+resin Usage: illuminating paths, lanes, sidewalks, flower beds, potted plants or fish tanks. This is the best DIY decoration for vases, fish tanks, aquariums, handicrafts, and swimming pools. Very suitable for gardens, courtyards, lawns, and courtyards. Frequently asked questions about luminescent stones: 1. Q: A glowing stone does not emit light, is it ineffective? A: Luminescent stone is a type of light storage product. The principle is that it can emit light by absorbing a light source. The illumination time is 8-12 hours each time, during which the first 1-2 hours are the highlight period and continue to emit light. The received product did not emit light because there was no absorption of light during the logistics process. As long as you receive sunlight or light for a period of time, you can shine again. 2. Question: Why do I have one day's sun during the day, but it still doesn't light up at night? A: Because the principle of luminescence is to absorb light and emit light, which means it begins to emit light while storing light. If light is absorbed during the day, but after dusk, the luminous period of the glowing light ends, so you can only see it slightly. Weak light, but when you turn on the light, you can see very bright. 3. Question: What is the brightest color of luminescent stones? A: Luminescent stones emit white light, such as bright yellow green, blue-green, and green. Color other colors with yellow green powder and colored powder. Ink powder will cover the luster of the luminescent powder. These pebbles can be illuminated in the dark for 1-2 hours after being exposed to strong light for 3 hours. Note: Due to differences between different monitors, images may not reflect the actual color of the item.