Apparatus and method of energy efficient illumination
US8541950B2 · kind B2 · utility
27Cited by
29References
26Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 20, 2010 |
| Grant date | Sep 24, 2013 |
| Priority date | — |
| Expiry date | Jan 11, 2032 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/40
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An illumination system reduces a level of light output, and hence power consumption, at a time after turning ON a light source, and increases the level of light output at a time prior to turning OFF the light source. A control subsystem can determine when to increase the level of light based on a predicted time when the light source will be turned OFF. The control subsystem may determine an average or median length of time that the light source has been turned on for a number of recent daily cycles. A control subsystem may be an integral part of a luminaire or may be a retrofit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.