Spot & Wash in one fixture

[icewolf08]

Yes, in an HMI lamp, I stand corrected, the metal vapor in the gas arc does produce most of the light. In xenon lamps, the light output is off of the positive electrode, or anode. (see alignment diagram. Picture credit, PTI Photon Technology International) The exception to this would be the common flash tube.

The light output is actually most intense on the cathode side, dropping off exponentially in a conical shape towards the anode in a pure Xenon lamp. While in a Xenon-Mercury lamp the highest light output is at each electrode with exponential fall of in a conical shape towards the center of the arc gap.

 

[JD]

Well I'll be! Being dyslexic, and having respect for you, I figured I'd double check in the Super Trouper manual. The PTI site does have it backwards. The attached Jpeg if from the super trouper manual, and shows the anode facing the rear of the lighthouse, so the focus would be on the cone of the cathode! Been a long while since I relamped one, you will have to forgive me!