Ellipsoidal have become a standard instrument in theaters today They are named for their reflectors which are shaped in an ellipse There are three generations of Ellipsoidal (also known as Lekos): the older generation with the lamp sticking out at an angle of approximately 75 degrees, the newer Ellipsoidal (called an Axial Ellipsoidal) in which the lens chimney either sticks straight out from the back or has been eliminated and replaced with a square housing in the rear of the instrument, the newest type is based on the ETC company's "Source Four" which incorporates many of the earlier functionality of the ellipsoidal with additional features and technology