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Al confronto con le vecchie lampadine a incandescenza, con le lampade LED si risparmia tanto, perché all’incirca abbiamo un consumo elettrico inferiore del 75% circa, cioè tenere accesa per un’ora una lampadina LED è come tenere accesa per 4 ore una lampadina a incandescenza, sempre a parità di flusso luminoso emesso.
Dalla tabella seguente possiamo vedere il consumo (in Watt) delle lampadine Led rispetto a quelle a incandescenza, ma anche un altro valore utile: il lumen, che è l’unità di misura del flusso luminoso emesso. Siamo stati abituati a valutare le lampadine in Watt, ma questa unità di misura non è corretta (sarebbe come valutare un computer in base a quanta luce consuma e non in base alla potenza del processore!) e dobbiamo abituarci sempre di più ai lumen.
Luminosità in Lumen (indicativa)
Consumo lampadina LED
Consumo lampadina a incandescenza
250
3 W
20 W
330
4 W
25 W
450
8 W
40 W
800
13 W
60 W
1100
17 W
75 W
1500
20 W
100 W
2000
25 W
150 W
Dalla tabella si nota il forte risparmio sui consumi passando all’illuminazione a LED.