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...