| 摘要 |
<p>An improved mercury vapor discharge lamp is disclosed. The lamp of the present invention includes an envelope (1) and a selectively reflecting silicon dioxide layer (3) on at least a portion of the inner surface of the envelope (1). The lamp further includes a phosphor coating (4) disposed on the selectively reflecting layer (3). The silicon dioxide layer (3) has a coating weigth of from about 0.1 to about 4 mg/cm2. The selectively reflecting layer (3) comprises at least about 80 weight percent silica having a primary particle size from about 5 to about 100 nm with at least about 50 weight percent of the silica having a primary particle size from about 17 to about 80 nm.</p> |
