发明名称 |
Solid state light emitting devices including adjustable scotopic / photopic ratio |
摘要 |
Solid state light emitting devices include multiple LED components separately arranged to generate spectral output having different ratios of scotopic to photopic light (S/P ratios) but similar chromaticities preferably within seven MacAdam ellipses. A light emitting device may be controlled to permit transitioning between different modes of operation of multiple LED components, with aggregated output of different modes having different S/P ratios but similar chromaticities. Multiple LED components of a light emitting device may be simultaneously controlled with different dimming profiles to effect increased color rendering at maximum emissive output of the apparatus, and to effect increased aggregated S/P ratio at minimum emissive output of the device. |
申请公布号 |
US9030103(B2) |
申请公布日期 |
2015.05.12 |
申请号 |
US201313763576 |
申请日期 |
2013.02.08 |
申请人 |
Cree, Inc. |
发明人 |
Pickard Paul Kenneth |
分类号 |
H05B37/02;H05B33/08 |
主分类号 |
H05B37/02 |
代理机构 |
Withrow & Terranova, P.L.L.C. |
代理人 |
Withrow & Terranova, P.L.L.C. ;Gustafson Vincent K. |
主权项 |
1. A light emitting apparatus comprising:
a first LED component arranged to generate a first spectral output including a first ratio of scotopic to photopic light (first S/P ratio), and including a first chromaticity; and a second LED component arranged to generate a second spectral output including a second ratio of scotopic to photopic light (second S/P ratio), and including a second chromaticity; wherein the first chromaticity and the second chromaticity differ by no more than seven MacAdam ellipses; and wherein the first S/P ratio is at least 20% greater than the second S/P ratio. |
地址 |
Durham NC US |