Ok, I see what you're talking about now. Well most folks down under use
Selecon and Selecon doesn't use an HPL lampj. Due to the banana shape their lamps mount straight up. I can certainly see how it would be bad to mount one upside down due to the heat management sytem. The things are designed so that as much IR as possible is passed out the top of the lamp through a heat sink, while the visible light is aimed forward by a cold mirror. If you mount one upside down your heat will want to come right back up into the
instrument instead, which can't be good. I don't know what kinds of lamps they are using but it could be that they are using something that is a "burn base down to horizontal"... which again makes sense due to the way heat is dealt with.
On the other hand up here with a Source 4, Shakespeare, or SL... it's almost impossible to mount one upside down due the the fact the lamp points straight in the back.
Let's wait and see if Ship can give us a lesson on position specific lamps.
__________________
Community College Technical Director
If you have learned as much from CB as I have,
donate now to keep CB alive for others to find and learn from.