The performance of an LED
The performance of an LED can range from 50 to 200 lumens per Watt. It is possible to find the same type of LED, for example a LED SMD 3528 that will generate 4 lumens or 9 lumens from the same manufacturer still consuming the same energy.
This difference in brightness is very important and trained a difference in price of the LED.
Each year, the maximum brightness increases regularly.
The LEDs used in general for fixtures are not the most powerful because the price would be too high. In general, the LEDs used are between 70 and 100 lumens per Watt.
The lumens per Watt
In the preceding paragraph, we talked about performance of the LED. But the LED must be fed by a driver (transformer). It consumes also the flow and performance of the complete luminaire is therefore lower than the single led.
Thus, a light fixture with a 7W LED consumes 8, 5W about. The number of lumens per Watt is therefore lower considering the complete luminaire.
There is no rule, some manufacturers use the power LED and others the power consumed.
Lumens and life
A LED can be used in a range of powers. For example, an average LED power will be able to be used with 7W 12W. Simply feed it with a driver that sends him more or less current to vary the power and the number of lumens.
However, to equal heat dissipation (radiator of the luminaire), the LED will last longer if it is used at 7W to 12W. So, it is easy to manufacture fixtures at low cost by using more low-power LED and using them to their fullest. This explains differences in price between the luminaires.
The hen we talk about lifespan of an LED, for example 35,000 hours, in reality, this means that at the end of 35,000 hours, with operation at rated temperature (cold LED), we’ll have a 15% drop in brightness after 35,000 hours.
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