A new addition to my collection. A 400w probe start metal halide lamp. These generally should be run vertically for optimum life, however they can be run horizontally. Due to hot spotting from the arc hitting the wall of the arc tube though this does have a detrimental effect on the lamp life.

Lighting Gallery album containing hi-res images of this and other MH lamps: https://www.lighting-gallery.net/gallery/displayimage.php?album=lastup\u0026cat=0\u0026pos=0\u0026pid=157737