| 摘要 |
PURPOSE:To enable light near to solar light by applying voltage exceeding the rating to a krypton bulb so as to light it. CONSTITUTION:A krypton bulb is used as a light source, and in case of applying the voltage exceeding the rating, preferably, the voltage of 110%-150% of its rating to a krypton bulb so as to light it, natural light which is excellent in color rendering properties and optimum for general illumination at a color temperature of about 2900K or more, preferably, from about 2950 to 3050K extending for a long time which is about four times the case of an argon bulb or more is radiated. In this case, it is to be desired that the whole luminous flux when voltage is applied and it is lit should be above about 1000lm or more, preferably, from about 1050 to 1200lm. Hereby, natural light near to the solar light can be obtained. |
