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OwnerSimon Grant Rozenberg, Ian Shaun Lawry +1inventors
InventorsSimon Grant Rozenberg, Ian Shaun Lawry, George Alan Limpkin
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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.
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 lamp of any preceding claim, wherein the inclination of the light results from passage of the light from diodes at progressively increasing distance from the axis through respective lens facets of progressively increasing inclination.
The lamp of any preceding claim, wherein the diodes are lensed.
The lamp of any preceding claim, wherein the diodes are at spacings one from another.
The lamp of any preceding claim, wherein the support carries an electrical circuit for supplying power to the diodes, the diodes being connected in parallel.
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.
Dependencies are inferred from the claim text.