Fixed Degree Ellipsoidals 

The concept of a fixed-degree ellipsoidal is to set the cone of light coming out of it. A 50 degree ellipsoidal will have a wider cone of light then a 19 degree unit. Being a fixed degree unit, it can only project a beam of that degree. If you need variable degrees, then consider purchasing extra lens barrels to swap out when you need to, or purchase variable zoom ellipsoidals. All in all, when choosing an ellipsoidal size, what matters is how far away the unit is and how large you want the circle of light.-Louie Lumen To learn more about ellipsoidals (lekos) please visit our free StageLightingTextbook.com