Electric lamp and discharge devices – With luminescent solid or liquid material – With gaseous discharge medium
Patent
1996-12-23
1998-12-22
Oen, William L.
Electric lamp and discharge devices
With luminescent solid or liquid material
With gaseous discharge medium
H01J 162, H01J 6304
Patent
active
058523430
ABSTRACT:
A fluorescent lamp having an adjustable color temperature comprising at least two elongated fluorescent discharge tubes (10 & 20), one tube (10) having a larger diameter than the other (20). The tubes (10 & 20) are assembled into a single unit. A groove (12) is disposed within the larger tube (10) and runs parallel to the longitudinal axis. The smaller diameter tube (20) is snugly nested within the groove (12) and in intimate contact with the larger diameter tube (10). The larger diameter tube has a phosphor coating producing one color temperature and the smaller diameter tube produces a different color temperature. Preferably, the larger tube has a phosphor coating that emits a low color temperature of 3000.degree. K. or below and the smaller tube's phosphor coating emits a high color temperature of greater than 10,000.degree. K. A controller divides the power to the two tubes such that a variable color temperature is produced at nearly constant total power.
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Aono et al., "Color Control of Fluorescent Lamps", The 7th International posium on the Science & Technology of Light Sources --Symposium Proceedings , p.81 (Aug. 1995).
Tanimizu et al, "Design Considerations for Color Temperature Variable Flourescent Lamps", The 7th International Symposium on the Science & Technology of Light Sources -Symposium Proceedings , p. 83 (August 1995).
Anandan Munisamy
Connolly Joseph
Ravi Jagannathan
Shea Michael J.
Matsushita Electric Works Researches and Development Laboratory
Oen William L.
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