| 摘要 |
<p>The electric lamp comprises a lamp vessel (1) which is transparent to visible light and which accommodates a light source (2). The lamp vessel (1) is covered with a combination of a light-absorbing medium (6) and an optical interference film (5) comprising layers of alternately a first layer of a material with a comparatively high refractive index and a second layer of silicon dioxide. According to the invention, the spectral transmission T of light transmitted by the light-absorbing medium (6) changes from T ≤ 0.15 to T ≥ 0.75 in a wavelength range having a width μ ≤ 50 nm. Preferably, the variation in reflection R amounts to less than 10 % in the wavelength range 400 ≤ R ≤ 690 nm. Preferably, the reflection R lies in the range 50 ≤ R ≤ 90 %. In operation, the electric lamp according to the invention emits colored light in the transmission mode (akkoord) and has a substantially color-neutral appearance in the off state.</p> |
