LED Lighting – LED Optics

The quality of the optical effect influences on the total efficiency of an LED lighting in a high degree. For the generation of directed light, for example in spotlights, ERCO therefore uses a proprietary projection optics. A collimator as a secondary lens, the link between the LED lens on the board and the exchangeable lenses. The collimator directs the light of the LEDs in parallel, so that then a tertiary lens can form the desired radiation pattern. The principle of total internal reflection in the collimator contributes to the high efficiency of the optics.

Optical principle

The light steering in LED emitters is made by three elements: The primary lens with the lens directly to the LED chip, for a hemispherical light output, the secondary lens as a collimator for parallel alignment of the light rays and the tertiary lens Spherolit. The choice of tertiary lens determines the radiation and is based on the particular application.


For all radiation characteristics – except for narrow spot – the three-piece collimator is suitable for the module with three LEDs. The orientation of the light beams takes place by total reflection at the side and the central lens. Precise interconnection points facilitate the safe and efficient installation.

Collimator for narrow spot

At LED spotlights and floodlights with the radiation, narrow spot, the corresponding collimator used. Its effect is based only on the optical principle of total internal reflection, which contributes to the high efficiency of the lighting system.


Due to the shape and material of the collimator for narrow spot, that works virtually no losses on the principle of total internal reflection and thus offers optimum efficiency in the light direction. After focusing the light beams through the collimator, the tertiary lens determined with the Spherolit the emission: from narrow beams of light across wide beams to asymmetric light intensity distributions for vertical illuminance.


ERCO’s extensive experience with optical simulations made it possible to solve new challenges such as the development of highly efficient lens systems innovation. Short distances for optimum quality: Photometric Laboratory, tooling and production of optical systems are located on the same site at ERCO, so computer simulations, prototypes and production parts can be directly compared.