| 摘要 |
An airfield marker light operating at a relatively low temperature. The marker light comprises a metal casing (1) to be flush-mounted in the ground, the casing having a vertical tube (1) with a lower bottom plate (1a) and including in its lower part a lamp (4) for emitting an upwardly directed light bundle, and optical means (5, 6, 7, 8) through which the upwardly directed light bundle passes and which include an upper, at least partially transparent cover plate (8) for emitting at least one light beam. According to the invention, the lamp (4) is mounted in effective heat conductive contact (3, 2) with the metal casing (1) adjacent to the bottom plate (1a), and the optical means include at least one transparent plate (5), which constitutes or is provided with a layer of a light filter and which along the whole circumference thereof is in effective heat conductive contact with the metal tube casing (1). |
