Profiles
These produce a hard edged beam that can be easily shaped or controlled. In a profile the plano convex lens can be moved to focus the beam. A common example in local theatres was the Strand Prelude 30 500/650W Profile. prelude30datasheet
A later development is the zoom profile that has two lenses to allow the beam angle or size to be varies as well as the focus.
Profiles usually have shutters fitted to allow the beam shape to be varied, such as changing it to a rectangular shape to light a doorway. The Selecon Acclaim Zoom Profile is available as 650W GY9.5 base version or the more efficient Axial Acclaim Zoom Profile that is as bright as most conventional 1000W profiles.
acclaim_axial_zoomspot_MKII Data sheet
A gobo can be fitted into a profile gate to allow for projection of a shape, such as a window or a leaf breakup.
The size of a profile can be adjusted by fitting an iris into the profile in the gate.