Fluorescent lamp utilizing a partial barrier coating resulting in assymetric or oriented light output

摘要

A lamp 10 comprising a light-transmissive envelope 12, the inner surface of which is only partially coated by a reflective barrier coating layer 14 such that an aperture 20 is created in the coating for light emission, the lamp exhibiting asymmetric light output through the aperture and lumens substantially equivalent to a lamp wherein the envelope inner surface is completely coated with a reflective barrier coating layer having no aperture. A laser ablation process for creating the reflective barrier coating layer aperture is also disclosed.