Abstract: A replacement lamp for an airport runway sign. Light is produced by a linear array of white-light LEDs. A cylindrical lens is mounted longitudinally adjacent to the LEDs, and collects a central portion of the light emitted from the LEDs. A pair of inclined surfaces extend from the lateral edges of the LEDs to respective lateral edges of the cylindrical lens. The inclined surfaces have a rough surface texture and reflect light diffusely. The inclined surfaces collect a peripheral portion of the light emitted from the LEDs, and direct the reflected light toward the cylindrical lens. The LEDs, cylindrical lens and inclined surfaces are all mechanically supported by a heat sink. The replacement lamp is placed into a runway sign near its top or bottom edge, and illuminates both viewing surfaces of the runway sign simultaneously without a diffuser.

Abstract: A two-sided airfield runway sign with direct illumination by a single LED lamp. Light is produced by a linear array of white-light LEDs. A cylindrical lens is mounted longitudinally adjacent to the LEDs, and collects a central portion of the light emitted from the LEDs. A pair of inclined surfaces extend from the lateral edges of the LEDs to respective lateral edges of the cylindrical lens. The inclined surfaces have a rough surface texture and reflect light diffusely. The inclined surfaces collect a peripheral portion of the light emitted from the LEDs, and direct the reflected light toward the cylindrical lens. The LEDs, cylindrical lens and inclined surfaces are all mechanically supported by a heat sink. The replacement lamp is placed into a runway sign near its top or bottom edge, and illuminates both viewing surfaces of the runway sign simultaneously without a diffuser.

Abstract: A retainer (23) includes two retainer portions (20, 21) surrounding lens (2). Lens (2) has a bearing surface (14) and an abutment surface (12), preferably two of each. In an intermediate stage of assembly, retainer portions when placed in confronting relation to each other around the lens are undersized in a lateral direction relative a principal dimension of lens (2). A projection (22) from a retainer portion (20, 21) bears against lens bearing surface (14), and an abutment-receiving structure (24), such as an aperture, bears against lens abutment (12). When the retainer portions (20, 21) are squeezed together and permanently connected, such as by weldment (40), projection (22) is urged more firmly against lens bearing surface (14) and lens abutment surface (12) is urged against lens aperture (24). Retainer portions (20, 21) are symmetric, and formed of sheet steel.

Abstract: A retainer (23) includes two retainer portions (20, 21) surrounding lens (2). Lens (2) has a bearing surface (14) and an abutment surface (12), preferably two of each. In an intermediate stage of assembly, retainer portions when placed in confronting relation to each other around the lens are undersized in a lateral direction relative a principal dimension of lens (2). A projection (22) from a retainer portion (20, 21) bears against lens bearing surface (14), and an abutment-receiving structure (24), such as an aperture, bears against lens abutment (12). When the retainer portions (20, 21) are squeezed together and permanently connected, such as by weldment (40), projection (22) is urged more firmly against lens bearing surface (14) and lens abutment surface (12) is urged against lens aperture (24). Retainer portions (20, 21) are symmetric, and formed of sheet steel.

Abstract: A method of retrofitting an existing airfield runway sign with a single LED lamp. Light is produced by a linear array of white-light LEDs. A cylindrical lens is mounted longitudinally adjacent to the LEDs, and collects a central portion of the light emitted from the LEDs. A pair of inclined surfaces extend from the lateral edges of the LEDs to respective lateral edges of the cylindrical lens. The inclined surfaces have a rough surface texture and reflect light diffusely. The inclined surfaces collect a peripheral portion of the light emitted from the LEDs, and direct the reflected light toward the cylindrical lens. The LEDs, cylindrical lens and inclined surfaces are all mechanically supported by a heat sink. The replacement lamp is placed into a runway sign near its top or bottom edge, and illuminates both viewing surfaces of the runway sign simultaneously without a diffuser.

Abstract: A two-sided airfield runway sign with direct illumination by a single LED lamp. Light is produced by a linear array of white-light LEDs. A cylindrical lens is mounted longitudinally adjacent to the LEDs, and collects a central portion of the light emitted from the LEDs. A pair of inclined surfaces extend from the lateral edges of the LEDs to respective lateral edges of the cylindrical lens. The inclined surfaces have a rough surface texture and reflect light diffusely. The inclined surfaces collect a peripheral portion of the light emitted from the LEDs, and direct the reflected light toward the cylindrical lens. The LEDs, cylindrical lens and inclined surfaces are all mechanically supported by a heat sink. The replacement lamp is placed into a runway sign near its top or bottom edge, and illuminates both viewing surfaces of the runway sign simultaneously without a diffuser.

Abstract: A replacement lamp for an airport runway sign. Light is produced by a linear array of white-light LEDs. A cylindrical lens is mounted longitudinally adjacent to the LEDs, and collects a central portion of the light emitted from the LEDs. A pair of inclined surfaces extend from the lateral edges of the LEDs to respective lateral edges of the cylindrical lens. The inclined surfaces have a rough surface texture and reflect light diffusely. The inclined surfaces collect a peripheral portion of the light emitted from the LEDs, and direct the reflected light toward the cylindrical lens. The LEDs, cylindrical lens and inclined surfaces are all mechanically supported by a heat sink. The replacement lamp is placed into a runway sign near its top or bottom edge, and illuminates both viewing surfaces of the runway sign simultaneously without a diffuser.

Abstract: A method of retrofitting an existing airfield runway sign with a single LED lamp. Light is produced by a linear array of white-light LEDs. A cylindrical lens is mounted longitudinally adjacent to the LEDs, and collects a central portion of the light emitted from the LEDs. A pair of inclined surfaces extend from the lateral edges of the LEDs to respective lateral edges of the cylindrical lens. The inclined surfaces have a rough surface texture and reflect light diffusely. The inclined surfaces collect a peripheral portion of the light emitted from the LEDs, and direct the reflected light toward the cylindrical lens. The LEDs, cylindrical lens and inclined surfaces are all mechanically supported by a heat sink. The replacement lamp is placed into a runway sign near its top or bottom edge, and illuminates both viewing surfaces of the runway sign simultaneously without a diffuser.

Abstract: An LED lamp assembly. The assembly includes a heat sink having an upper outermost peripheral portion deformed continuously around an entire perimeter of the heat sink radially inward towards a peripheral rib in a housing cover, whereby the peripheral rib is compressed towards an inner rib of the heat sink thereby locking the housing cover to the heat sink.

Abstract: An LED lamp assembly. The assembly includes a heat sink having an upper outermost peripheral portion deformed continuously around an entire perimeter of the heat sink radially inward towards a peripheral rib in a housing cover, whereby the peripheral rib is compressed towards an inner rib of the heat sink thereby locking the housing cover to the heat sink.