RETROFIT LIGTH BULB

摘要

A retrofit light bulb (1) is disclosed. The retrofit light bulb (1) comprises a substantially flat heat spreader (2) having an opening (5); first and second cover members (7, 8) sandwiching the heat spreader (2), each cover member (7, 8) having a protruding portion (9, 10) directed away from the heat spreader (2) and aligned with the opening (5), the two protruding portion (9, 10) together forming a compartment (11); and one or more solid state lighting devices (18) mounted on a carrier (19) arranged in said compartment (11), in thermal contact with the heat spreader (2), wherein said one or more solid state lighting devices (18) are arranged so that each protruding portion (9, 10) receives light directly from each solid state lighting device (18). The compartment thus forms a single light mixing chamber in which light emitted by all of the SSL devices is mixed.