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We have not yet had the chance to install this product. I wanted to see, with this poll, how others would receive it, and what questions they may have. The sample we received today - took it out the box (USPS from TX on 1/30/15), sat it outside in direct sunlight for 5-7 minutes, took it in an office with no windows, shut the lights off and it glowed. It now has been sitting in our design center, not in direct sunlight, for about an hour. Just now took it back to the office, shut the lights off and it's still glowing! I'm sure that if something is directly in path of the sun to the product, it could have a slight effect on the glow (like an umbrella stopping direct sunlight, but you can still read a book under an umbrella, so this would be a chance for charge), but with the way the sun rotates throughout the day, it seems there would be ample time for all tiles incorporated in a project to charge before nightfall, allowing for a consistent glow. The sample in our office, is seeming to even charge off artificial light (something like the technology in my son's glow in the dark decal t-shirt, but more advanced!). Illumaseal says the product can even charge on a cloudy day, but would work more strongly on a sunny one. I would request two sample tiles, and set one in direct sunlight, and the other in a shadier area, then compare the two at nightfall! Good question Arbordale!

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Houzz Pool & Spa Forum link http://ths.gardenweb.com/forums/pools