Abstract: A low pressure discharge lamp, particularly a compact fluorescent lamp, achieves an overall reduction in height by orienting ends of the envelope radially inward for connection to the base. This advantageously positions the electrodes housed within the envelope away from the base. Moreover, this mounting arrangement provides resistance against pull out forces and elimination of a cement to secure the envelope to the base, as well as other improved heat transfer benefits.

Abstract: A compact fluorescent lamp is provided in a coiled or helical configuration in order to maximize the length of discharge tubing for a given height. A non-uniform coating of phosphor is provided on the interior surface of the discharge envelope to inhibit light otherwise directed inwardly into the lamp toward a longitudinal axis of the helical configuration and redirect the light outwardly through an outer circumferential portion having a thinner phosphor coating. This results in increased light output for an given lamp geometry and lamp power.

Abstract: A compact fluorescent lamp is provided having a generally helically shaped lamp envelope wherein the two end segments of the lamp envelope extend radially inward from the pitch of the helix. The end segment extend into openings formed in a mounting cap member which is essentially dome-shaped at the center portion thereof. The mounting cap member can be constructed of two pieces each of which accepts one of the end segments of the lamp envelope. The mounting cap member is effective for reducing the amount of lamp envelope surface area that must be disposed within the housing of the lamp and is further beneficial in that light generated on the inside surface of the lamp can be reflected outward and more readily escape without losses due to multiple reflections or absorption.