| 摘要 |
<p>Provided is a ceramic metal halide lamp (1) in which two light-emitting tubes (3a, 3b) are arranged electrically in series inside the same outer globe (2), wherein, by arranging the two light-emitting tubes (3a, 3b) in such a way that light-emitting sections thereof do not overlap, decline in lifespan due to the heat of one light-emitting tube causing the temperature of the other light-emitting tube to increase and lighting failure due to an increase in lamp voltage do not occur, and by setting the distance from an electrode tip at a metal-cap (4) side of the first light-emitting tube (3a) to an electrode tip at a lamp-top side of the second light-emitting tube (3b) to be equal to or less than 3.5 times the average inter-electrode distance of both light-emitting tubes (3a, 3b), a preferable distribution of light is implemented.</p> |
