There is no formula for lighting designers to directly correlate the luminous flux of the LED component used or the power consumption of the LED device to the performance of the entire LED luminaire.
Hella manufactures LED lamps that equal the performance of some competitors LED luminaires with the Hella product consuming only half the power to achieve this performance. Compared to conventional lamps the power consumption of LED luminaires can be over 80% lower. While lumen output of the LED does describe how much luminous flux is generated it does not indicate how effectively that light is distributed.
Our light performance charts show luminance and spread in an easy to read format. At the top is the spread, with the boundary threshold being defined as half the peak luminance. While there is light beyond the indicated angles, the majority of light will be inside the cone shown. The difference between lux (luminance) and lumen (luminous flux) is that lux takes into account the area over which
the luminous flux is spread. Accordingly the lux figure decreases
Most interior lamps will be installed at around the 2 - 2.5 metre height. As a guideline some 40 - 100 lux is required for corridors and passageways, and around 300 lux for reading and 500-800 lux for offices.
The spread pattern may not be designed symmetrical so the spread horizontally (H) and vertically (V) are given.