Designing in lumen classes
Designing according to lumen classes is suitable for the approximate selection of luminaires. Independent of the efficiency increase with LEDs, the luminous flux specifies the utilisable illumination output. The more efficient the luminaire, the higher is the illuminance on the target plane. Efficiency decreases with excessive spill light. The required luminous flux can be determined via the illumination distance, the light distribution and the desired contrast ratio to the surroundings.
Lumen packages for low rooms
To achieve a contrast of 1:5 with ambient lighting of around 200lx, accent lighting with 1000lx is needed. For its various light distributions from narrow spot to extra wide flood, ERCO offers a wide range of lumen classes. The wider the light distribution, the higher the lumen output of the luminaire must be.
Lumen packages for medium room heights
Medium room heights require a higher luminous flux compared to low rooms due to the lighting distance. With a lighting distance of 4m, extra wide flood light distribution is no longer suitable for floodlighting accent purposes. The light beam diameter already reaches around 7m in such cases. Wide flood light distribution is therefore sufficient for large objects to achieve a light beam with a diameter of 3-4m.
Lumen packages for high rooms and with daylight
To achieve significant accent lighting in high rooms as well, narrow light beams with high luminous flux are indispensable. At a lighting distance of 6m, narrow spot light distribution generates a light beam diameter of around 0.7m and spot light distribution a diameter of 1.6m. To achieve significant accent lighting despite a high daylight component and high ambient lighting, the narrow light distributions are also available with high luminous flux. Very wide light distributions such as extra wide flood, wide flood and flood are no longer suitable for distinctive accenting and the risk of glare increases.