GLOSSARY OF LIGHTING TERMS
LUMINOUS FLUX [lumen]
The luminous flux is the amount of light generated from a luminaire. This value is only relatively representing the performance of a product, as it is up to the optics to use this light in an efficient way. Distributing the lumens (light) only where needed provides extra energy savings. We strictly declares the lumens of broadly available products, not theoretical values as many competitors do.
ILLUMINANCE [Em, lux]
The illuminance is the quantity of light hitting a specific surface, like a road or a warehouse floor. Illuminance is the measuring parameter to consider for sidewalks, pedestrian crossings, roundabouts and all the industrial lighting.
LUMINANCE [L, cd/m2]
The luminance is the quantity of light that the observer’s eyes (usually a driver) see, reflected from an area of 1m2 of the road surface seen from distance. It is the measuring parameter for streetlighting and tunnell lighting, as it represents a model of the real world driving conditions, where obstacles must be identified in time to permit a reaction.
LONGITUDINAL UNIFORMITY [UI]
Longitudinal uniformity is calculated from the ratio between minimum luminance [Lmin] and maximum luminance [Lmax], measured on the axis of the lane. The measurement is repeated for every lane.
It’s a primary importance value in street and tunnel lighting design. An uniformity level below the minimum requirement is clearly visible when dark and bright stripes are evident on the pavement.
LUMINOUS FLUX [lumen]
The luminous flux is the amount of light generated from a luminaire. This value is only relatively representing the performance of a product, as it is up to the optics to use this light in an efficient way. Distributing the lumens (light) only where needed provides extra energy savings. We strictly declares the lumens of broadly available products, not theoretical values as many competitors do.
ILLUMINANCE [Em, lux]
The illuminance is the quantity of light hitting a specific surface, like a road or a warehouse floor. Illuminance is the measuring parameter to consider for sidewalks, pedestrian crossings, roundabouts and all the industrial lighting.
LUMINANCE [L, cd/m2]
The luminance is the quantity of light that the observer’s eyes (usually a driver) see, reflected from an area of 1m2 of the road surface seen from distance. It is the measuring parameter for streetlighting and tunnell lighting, as it represents a model of the real world driving conditions, where obstacles must be identified in time to permit a reaction.
LONGITUDINAL UNIFORMITY [UI]
Longitudinal uniformity is calculated from the ratio between minimum luminance [Lmin] and maximum luminance [Lmax], measured on the axis of the lane. The measurement is repeated for every lane.
It’s a primary importance value in street and tunnel lighting design. An uniformity level below the minimum requirement is clearly visible when dark and bright stripes are evident on the pavement.
