| 摘要 |
A light fixture, such as for an overhead street light, is disclosed. A light redirection device (1) may have a central axis (CA), a front-back plane (FB) through the central axis (CA) that separates a front volume (FV) from a back volume (BV), and a left-right plane (LR) through the central axis (CA) and perpendicular to the front-back plane (FB). The light redirection device (1) may include a lens (10) for producing output light (9) skewed toward the front volume (FV). The lens (10) may have a recessed inner face (11) facing the hemisphere (3) that is generally symmetric with respect to the left-right plane (LR) and is asymmetric with respect to the front-back plane (FB). The inner face (11) may have a concave central region (CR), a convex peripheral region (PR) and an inflection zone (IZ) between the central region (CR) and the peripheral region (PR). The lens (10) may have an outer face (12) facing away from the hemisphere (3) that is generally symmetric with respect to the left-right plane (LR) and is asymmetric with respect to the front-back plane (FB). The outer face (12) may be convex or flat along the outer face (12) and may have a maximum protrusion at a location (L) laterally displaced from the central axis (CA) along the left-right plane (LR) in the front volume (FV). |
