| 摘要 |
The invention relates to the field of optics. An optical element for a lamp is carried out in the form of a sheet with pyramidal indentations having varying numbers of faces, preferably four, each pyramidal indentation having a flat bottom located at a depth, from the surface of the sheet or plate on the side with said indentations, of between 60 and 90 percent of the height of an imaginary non-truncated pyramid, the faces of which correspond to the faces of said indentation, and the lamp consists of a light source and said optical element. |
