Lighting device with reduced light output degradation
US9618161B2 · kind B2 · utility
0Cited by
6References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 6, 2015 |
| Grant date | Apr 11, 2017 |
| Priority date | — |
| Expiry date | Jul 6, 2035 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF21Y2115/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A lamp includes a substrate having a center region and a peripheral region, a first subset of light-emitting devices disposed on the center region, and a second subset of light-emitting devices disposed on the peripheral region. A temperature difference between the center region and the peripheral region is greater than 10 degrees.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.