Lamps, luminaires and lighting systems

摘要

The invention relates to LED-based lamps, luminaires and lighting systems for buildings particularly, though not exclusively, for providing emergency light in the event of power failure. In particular it provides a light-emitting diode lamp comprising a support ( 26 ) and an array of light emitting diodes ( 58 ) on the support, an optical axis ( 72 ) passing through the middle of the array ( 58 ) and diodes increasing in number and increasing in inclination with distance from the optical axis ( 72 ). It also provides a luminaire ( 24 ) comprising a lamp as described above and a lens ( 30 ) having facets for generally un-deviated and un-reflected passage of light from off-axis diodes, and a building emergency lighting system comprising luminaires ( 24 ) as described above. In an alternative embodiment inclination of the light is through progressively increasing inclination of the facets.