[54] FLUORESCENT LAMP WITH IMPROVED CRI AND BRIGHTNESS
[75] Inventor: Romano G. Pappalardo, Sudbury, Mass.
[73] Assignee: GTE Products Corporation, Danvers, Mass.
[21] Appl. No.: 967,607
[22] Filed: Oct. 28, 1992
[51] Int. CI.6 H01J 1/62
[52] U.S. CI 313/487; 313/485; 313/486
[58] Field of Search 313/487, 484,
313/486; 252/309.36, 700, 301.4 R, 301.4 F;
345/47
[56] References Cited
U.S. PATENT DOCUMENTS
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4,034,257 7/1977 Hoffman 313/487
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4,728,459 3/1988 Fan 252/301.5
4,797,594 1/1989 Sigai et al 313/488
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5,232,626 8/1993 McSweeney 252/301.4
FOREIGN PATENT DOCUMENTS
60-14743 1/1985 Japan .
62-02444 5/1987 Japan .
Primary Examiner—Amare Mengistu
Attorney, Agent, or Firm—Carlo S. Bessone
[57] ABSTRACT
A fluorescent lamp has a coating on the interior surface ol the glass envelope comprising an alkaline earth metal halophosphate phosphor and a quad-phosphor blend wherein the combination ol phosphors result in a predetermined color point from about 2700 to about 4200 K on or near the Planckian locus where the alkaline earth metal halophosphate phosphor comprises a blend ol halophosphate phosphors having a color temperature substantially matching the color temperature ol the quad-blend which includes an europium activated aluminate as a phosphor component.
20 Claims, 14 Drawing Sheets
