The continuous evolution of "LED" technology, determined by an increased "luminous efficiency" and the lower consumption in terms of...
Practically speaking, we remember that one of the main parameters to be considered in lighting is the luminous efficiency which is the ratio between the luminous flux and the current consumed. This ratio is expressed in lumens/Watt and, as can be seen from the graph, this efficiency has more than doubled over the last decade, from 131 lm/W in 2006, to 276 lm/W in 2013, before reaching, in March 2014, the 303 lm/W.
However, given that the frequent evolution of manufacturing technologies will lead to new increasingly high performance LED, our lighting equipment, which adopt LEDs of different specific sizes and types, will have a constant update in terms of absorption, downward trend, to equal or most luminous flux, (it will depend on the availability of products that will offer LED manufacturers), with the obvious consequence that will be able to illuminate large areas with fewer number of lighting fixtures and/or lower energy consumption. Therefore, LEDs technical data and electrical parameters undergo periodic variations and improvements in general that find a match within the certificates of conformity as maximum permissible values.
The above means that in the coming years we will see a further improve of lighting efficiency and a decrease in energy consumption, as a result of the implementation of the EU Directive 2012/27/EU concerning the promotion measures and improvement of energy efficiency. In the near future, LED lighting will have an increasing light output in relation lm/W and lux on the ground, with less expenditure of energy consumed, equal to the total luminous flux.