Difference between revisions of "Lenses"

Instead of a flat lens, an aspheric lens can be used that will focus the light into a tighter beam. By moving the lens with respect to the emitter, a tight beam or wider flood can be obtained. Lights with a movable lens are called flood-to-throw lights. Though frequently called aspheric, many times the lens involved has the traditional curvilinear shape and therefore isn't really aspheric.

Also called a "collimating lens", a TIR optic takes advantage of "total internal reflection" where light that that strikes a surface at a shallow angle will bounce off the surface and continue through the material instead of scattering. The optic collimates the light and sends a concentrated beam of light out in the same direction, giving a tight hotspot with greater throw. With a TIR optic in place, a reflector is not needed.