Convection air-cooling of a compact electric discharge lamp unit that is adapted for use as a screw-in energy-conserving substitute for an incandescent-type lamp bulb is enhanced by partitioning the lamp housing into two separate compartments and providing vents and connecting air passageways that direct...http://www.google.de/patents/US4503360?utm_source=gb-gplus-sharePatent US4503360 - Compact fluorescent lamp unit having segregated air-cooling means
