The GravityLight uses gravity, acting on a weighted bag, to generate energy. great for camping or off-grid living -- no batteries. no solar cells that need sun. no hand cranks that lose their spring.
Electric ballasts are a crucial part of your growing setup.don't make the wrong choice. All you need to know about MH and HPS ballasts is in this guide.
The Water-Scraper Designed by Malaysian architect Sarly Adre bin Sarkum. The building would generate its own power using wave-power, solar energy and wind power, and has its own farms, including aquaculture and hydroponics farms.
Universal 13038 3 Lamp 120 volt Fluorescent Ballast