Learning Center / Photometry and Lighting

Photometry and Lighting - Outdoor Lighting

Photometry and Lighting - Outdoor Lighting

Photometric performance: highly advanced optical systems

Deeply aware of our environmental responsibilities, we have increased our efforts towards improving visibility, energy efficiency and safety while reducing light pollution. The night sky is a treasure; one of Lumecís inherent objectives is to preserve it.

Beyond the aesthetic qualities of our lighting fixtures and the precision of their fabrication, the light produced by Lumec products represents an ideal balance between the lightís intensity and uniform, effective photometric distributions. To direct the light at exactly the right place and desired intensity, Lumec offers a wide array of models, including reflector, refractor and compound optical systems.

Equipped with layers of precisely designed prisms, refractors direct both the horizontal and vertical luminous flux. This refinement in light control gives a feeling of safety where our lighting fixtures are installed, while the integration of a reflector provides a more uniform illumination. The accuracy of the reflectorsí cut off angles limits the glare in applications demanding long-distance visibility.

This versatility allows you to choose lighting fixtures with the assurance that you will get optimal photometric performance and responsible use of energy resources for sustainable designs.


Uniformity of light is measured by creating a matrix of points on the target area being lit and then measuring the light intensity at each of those points. For example, a perfect uniformity of light would have an average over min ratio of 1 (all points on the matrix receive the same amount of light on the lighting zone). Using our own refractors and reflectors permits us to precisely control how much light is cast in all directions around the luminaire. Uniformity is important because it assures adequate and uniform levels of lighting in all target zones. At Philips Lumec, we have our very own optic design department and they help create our luminaires in function of the area being illuminated, giving us absolute control over uniformity, and giving our clients the best possible light uniformity available on the market.


Intensity of light is another very important aspect of controlling light. The intensity provided by the optical system is measured by how much light is being used to illuminate any given area. Intensity is a function of how efficient the optic control is, of how much total light is being used to illuminate any given area. For example, typical urban luminaires only use 15%-30% of the light they cast to illuminate the target area and the rest is wasted, by comparison, Philips Lumec luminaires are in the 50%-65% range. The proper optic control of uniformity assures the best possible intensity, and that provides the most energy efficient luminaires to the client. Everything depends on the observer, the site, the skills of the design team, and many other variables, but since Philips Lumec has their own in-house optic design department, we can flawlessly control the quantity of light a luminaire is casting in every direction, giving our clients the perfectly adapted solution to their individual intensity needs.