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While an isolated LED has very good energy efficiency (around 150 lm / W and up to 220 lm / W for the most efficient), an LED lamp offers an efficiency of between 40 and 80 lumens per watt. This drop in efficiency is linked in particular to the heat produced by the diodes placed side by side in the lamp.
Thus, LED lamps currently on the market generally have a much higher energy efficiency than conventional lamps: 70 lumen / W for compact fluorescent lamps and only 16 lumen / W for incandescent lamps.

Fortunately, the majority of lamps intended for domestic lighting today offer a satisfactory quality of lighting: an LED lamp of over 800 lumens (equivalent to a 60W incandescent lamp) consumes only 9-12 watts, a 400 lumens LED consumes approximately 6 watts.
In addition, technological developments should make it possible to improve the efficiency of LED lamps for the general public by raising it to around 100 lm / W. “Super bright” LEDs can already achieve energy efficiency of up to 300 lm / W in the laboratory! This means that eventually we will be able to have lamps that consume less than 4 watts and that light up like a 75 watt incandescent lamp.

Instant maximum lighting

LED bulbs reach a maximum level of brightness as soon as they are switched on. Indeed, LED sources admit frequent switching on and off cycles. They instantly emit the desired luminous flux, without ramping up, which can be advantageous for specific applications such as passageways.