Patent ID: 6142415
Filing Date: 2000-11-07
Classification: A63H,F21V,G09F

Abstract:
A lighter than air device comprising a helium containing balloon secured to the ground and enclosing a light source positioned approximately in the middle of the balloon, the balloon being secured on a rod (40) which mounts the light source, a power feeder cable being connected to the light source and mounted through the rod, the light source having a power of at least 1,000 watts, sufficient helium being employed for cooling purposes, the balloon being constructed of a thin, flexible and expandable polyurethane film which is transparent to the outward flow of light and heat radiation without damage to the balloon, and impervious to the helium, and an outer envelope surrounding the balloon and constructed of a colored material, with optical properties which enable the outer envelope to receive and diffuse light from the balloon, without dazzling a viewer, and providing effective ground based lighting over a ground surface area of at least 1,000 m.sup.2.