Lamps, luminaires and lighting systems
First Claim
1. A light-emitting diode lamp comprising a support and an array of light emitting diodes on the support, the light-emitting diode lamp having an optical axis, wherein:
- diodes in the array increase in number in a first direction with increasing distance from the optical axis in a second direction, the second direction being at right angles to the first direction; and
the propagation direction of light from at least some of the diodes increases in inclination to the optical axis with increasing distance of the diode from the optical axis in the second direction,thereby providing substantially uniform illumination within a plane lying at right angles to the optical axis.
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Accused Products
Abstract
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.
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Citations
24 Claims
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1. A light-emitting diode lamp comprising a support and an array of light emitting diodes on the support, the light-emitting diode lamp having an optical axis, wherein:
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diodes in the array increase in number in a first direction with increasing distance from the optical axis in a second direction, the second direction being at right angles to the first direction; and the propagation direction of light from at least some of the diodes increases in inclination to the optical axis with increasing distance of the diode from the optical axis in the second direction, thereby providing substantially uniform illumination within a plane lying at right angles to the optical axis. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification