Lamps, luminaries and lighting systems
First Claim
1. A light-emitting diode lamp comprising a support and an array of light emitting diodes on the support, an optical axis passing through the middle of the array, wherein:
- the diodes increase in number with distance from the optical axis; and
the light from the diodes increases in inclination with distance from 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, an optical axis passing through the middle of the array, wherein:
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the diodes increase in number with distance from the optical axis; and
the light from the diodes increases in inclination with distance from 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)
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24. A light-emitting diode lamp comprising a support and an array of light emitting diodes on the support, and control means for causing the lamp to operate in a first mode to provide emergency lighting and in a second mode to provide continuous security lighting and to operate at a first power during emergency lighting and at a second power less than the first power during security lighting.
Specification