“The first and second lenses operate jointly to concentrate and collimate the incident light beam.”

“The original lens cell is an air spaced semi-apochromatic doublet, which uses three adjustment screws to collimate the lenses in the machined aluminum cell.”

“Developed and injection moulded in optical quality PMMA, these lenses collimate an optical beam emitted by a cluster or group of 4 to 12 high power leds.”

“This is incident on a curved mirror, set at grazing incidence, which collimates the beam in the vertical sense.”