| 摘要 |
<p>A light bulb (1) includes a pair of electrodes (3), and I/S is less than 20 A/mm2, where S is the cross section of the point of the electrodes (3) and I is the current that flows between electrodes (3) at rated power for the bulb. Since this condition prevents the light bulb (1) from blackening or the increase in the lamp voltage, which can occur due to the evaporation of the electrodes with time, a long service life can be achieved.</p> |
