OSRAM HMI lamp 18 kW SE GX51/2 (Hydrargyrum medium-arc iodide lamp), single-ended.
<a href="//commons.wikimedia.org/wiki/User:Daniel*D" title="User:Daniel*D">Daniel*D</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>