lens tube

Hi guys, I have some altman 3.5Q with two different lenses and I'm trying to figure out which lens tube is which degree. Anyone play with these and can tell which is which? I THINK the one of the left is 38° and the one on the right is 28° but I just want confirmation.

As a designer, you have a variety of lens tubes to choose from when using an ellipsoidal. So how do you decide which is best for a particular project? Mike Graham offers some advice on a selection process that is "part art and part science."

I recently acquired a large number of Electro Controls ellipsoidals. I've looked everywhere I can think to look, I've found similar lights but none the same. I was told these lights originally came from the Manti Pagent held by the LDS church. They are rather large the thing that makes them...