We have had these on our children's wall for the last 2 weeks, and every night even though we always open their curtains, these never seem to charge themselves via natural light, we have had to buy a LED torch and just before they go to bed, I go and hold the torch over them to charge up the chemicals in these, so they can actually glow in the dark, but even doing that they only last for about 20 mins which so far has been enough time for our boys to fall asleep before they discharge, very disappointed with these.
Just decorated my sons birthday as a dinosaur theme when I saw these and thought great!!!
Put them on the ceiling as soon as they arrived and slowly one by one these lost there stickiness and starting to fall down from the ceiling. With that and poor glow in the dark or should I say no glow in the dark I won't be buying again. Luckily they didn't cost much, but still expected them to work!