Abstract: Fluorescent bulb with inner tubes of inert gas and phosphor coating on the inner surface of an outer bulb that encompasses the inner tubes. The increased efficiency of such light bulbs enables the same strength light emission in a smaller size bulb.

Abstract: An electrostatically charged rotating plate or cylinder is used to attract electrostatically charged particles in smoke to avoid pollution and improve the efficiency of the filtering process. The rotating plate is constantly cleaned from the ionized particles adhering to it and the particles so collected are removed without polluting the environment. This filtering system reduces capital and running costs compared with the present filtering systems.