Life Expectancy of “This” - 700 YEARS (excluding electrical parts of course) THIS contains 50-100 water/soda bottles depending on it’s size and YES that's per light! These materials are now extremely hardened via our unique fusion process, extremely durable and have the extreme appearance of glass. We use “found” items which were headed straight for our landfills, WHICH we PERSONALLY gather ourselves from ball parks, public school grounds, parks, etc. Cleaning your lighting: just unscrew fixture, squirt with hose or give it a shower in the tub...for regular cleaning feather dusters work great