Variable color lighting device
US4996465A · kind A · utility
4Cited by
5References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 22, 1989 |
| Grant date | Feb 26, 1991 |
| Priority date | — |
| Expiry date | Jun 22, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B41/3927
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A variable color lighting device employs two gases having different ionization potentials and sealed in a lamp tube. A cathode and anode are disposed inside the lamp tube opposed to each other and connected to a power supply source for varying applied voltages thereto to vary light emitting ratio of the two gases for different color light generation, in accordance with the applied voltages. A variable color lighting can be realized at relatively low voltages with a simple and economical control circuit, and an increased light emission output can be attained to render the device utilizable as a main lighting source.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.