| 摘要 |
<p>A high pressure discharge lamp having a discharge device (10) within a gas filled outer envelope (1, 2). Improved means for controlling heat loss from the discharge device is comprised of a translucent sleeve (25) open at both ends (26) and having an inside diameter selected to be within a sheath around the discharge device in which the velocity of the gas fill from convection currents is reduced, resulting in reduced convective heat loss from the discharge device. The diameter of the sleeve can be selected to minimize heat loss or to obtain the same heat loss as when the discharge device is operated in an evacuated outer envelope. <IMAGE></p> |
