The HydraCell UT-DL Utility Downlight is a revolutionary LED hanging lantern powered by our proprietary HydraCell fuel cell. Three bright, long-life LEDs provide down facing light to illuminate desks, discreet areas or any places where bright directional light is needed away from wired electrical grids. The replaceable HydraCell fuel cells can be stored prior to first use for 25+ years and is activated instantly to full capacity simply by dipping in water. Once activated the cell will operate continuously under load, requiring only periodic re-hydration. After 300+ hours, depending on load and usage, an inexpensive new or refurbished HydraCell fuel cell immediately restores the Downlight to a like-new condition.