The rapid evolution of LED: more lumens and less actual energy consumption

The continuous evolution of "LED" technology, determined by an increased "luminous efficiency" and the lower consumption in terms of...

The continuous evolution of "LED" technology, determined by an increased "luminous efficiency" and the lower consumption in terms of absorption (W), requires a constant updating of technical documentation of LED lighting fixtures by our Research and Development office. This activity was not necessary and frequent for the lighting equipment equipped with traditional gas discharge, filament or incandescent lamps, rather static from the technological point of view.

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.

Source CREE

LED floodlights EVL-70B series

Lighting fixtures FLF-222L series

Considering, also, that these values refer to the pure LED and that, if placed in lighting fixtures suffer a loss of efficiency resulting from the presence of thick glass and/or optics, in our documentation, we declare the maximum possible allowable values of absorption, compatibly with the temperature class of these lighting fixtures and with the result and the knowledge that they will have nominal data that differ in time, due to the advancement of LED technology but always responsive to the products reference certificate.

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.

Tuttavia, dato che l’evolversi frequente delle tecnologie produttive porterà a nuovi LED sempre più performanti, i nostri corpi illuminanti, che adottano grandezze specifiche e tipologie di LED differenti, subiranno un costante aggiornamento in termini di assorbimento, tendenziali al ribasso, a parità o a maggior flusso luminoso (dipenderà dalle disponibilità di prodotto che offriranno i produttori dei LED), con la ovvia conseguenza che si potranno illuminare aree più grandi con un minor numero di corpi illuminanti e/o minor consumo di energia. I dati tecnici e i parametri elettrici di riferimento per i LED subiscono quindi variazioni periodiche e miglioramenti in generale, che trovano una corrispondenza all’interno dei certificati di conformità come valori massimi ammissibili.

Quanto sopra sta a significare che nei prossimi anni assisteremo ancora ad un miglioramento dell’efficienza luminosa e ad una diminuzione dei consumi energetici, come conseguenza dell’attuazione della direttiva comunitaria 2012/27/UE che stabilisce le misure di promozione e miglioramento dell’efficienza energetica. Nel prossimo futuro i corpi illuminanti a LED avranno una sempre maggior resa luminosa in rapporto lm/W e lux resi a terra, con un minor dispendio di energia consumata, a parità di flusso luminoso totale.

Publication date: 2016-11-14

Topic: Additional information