1. An optical arrangement, consisting of a first and a second optical element being mutually moveable along an axis for generating a variable light output beam:the first optical element for collimating light from a light source to generate collimated light;
the second optical element for receiving collimated light from the first optical element, wherein an array of convex lenses located on a first face of the second optical element is associated with an array of convex lenses located on a second face of the second optical element opposite the first face,
wherein for each lens located on the first face the collimated light passing through said lens is designed to pass through an associated, directly oppositely positioned lens of the array of lenses located on the second face, and
wherein each lens on the second face is designed to focus on the associated lens on the first face, and each lens on the first face is designed to focus on the associated lens on the second face, and,
wherein the arrays of lenses on the first and second faces have an increasing or decreasing lens diameter towards the edge of the second optical element, such that a spread of output angles of the light output from the second optical element increases or decreases with increasing distance from the center of the second optical element, and the spread of output angles at the output of the optical arrangement is dependent on the spacing between the light source and the first optical element or the spacing between the first and second optical elements.