| 摘要 |
<p>A lighting unit according to the invention comprises an electrodeless low-pressure discharge lamp (10) and a high-frequency supply (40). The electrodeless low-pressure discharge lamp (10) is provided with a discharge vessel (20) which is closed in a gastight manner, comprises an ionizable filling, and has an enveloping portion (21) and a recessed portion (22) surrounded by the enveloping portion, which enveloping and recessed portions of the discharge vessel (20) each support a luminescent layer (24, 25, respectively). The electrodeless low-pressure discharge lamp (10) is in addition provided with a coil (30) which is arranged in the recessed portion (22) of the discharge vessel (20) and which is electrically connected to the supply (40). The conversion efficiency of the luminescent layer (25) on the recessed portion (22) is relatively high compared with that of the luminescent layer (24) on the enveloping portion (21). This measure renders possible a lower temperature of the core (31).</p> |
