why led lights are measured in lumens and not watts

by:ILED     2019-11-30
The lighting industry is changing the way we pick bulbs.
As of September 2010, 1st, it has become the EU for all lighting equipment, which should be written in lieu of Watts.
For many years, we have been buying bulbs based on the wattage of the bulbs.
With the arrival of energy-efficient bulbs on the market, the term becomes redundant.
Watts can only tell us how much energy the bulb uses, not the type or amount of light we send out.
Compared with halogen lamps and fluorescent bulbs, the power used by LED lights is very small, and the amount of light generated at the same time is the same.
This makes it difficult to measure their performance with Watts and makes it harder to compare. What is lumens?
Lumens are measurements of the total amount of visible light emitted from the light source.
A lumens is roughly the same amount of light as a birthday candle, 1 feet away from the observer.
Therefore, the light bulb that produces 1 lumens will be as bright as the birthday candle.
A 100 lumens bulb will be as bright as the 100 birthday candles seen from 1 feet m.
The efficiency of the bulb is expressed by lumens per watt (lm/W)
Also known as its lumensto-watt ratio.
When we talk about lumens per watt, we are measuring how much lumens are generated from electricity consumed per watt.
Of course, it will be more effective if a bulb produces more lumens and consumes less watts.
The most efficient incandescent lamp can only produce 17 lumens per watt. CFLs (
Compact fluorescent lamp)
The efficiency is slightly higher, and the running speed is between 35 lumens per watt and 60 lumens.
LED lights show even more impressive numbers.
A typical LED can easily manage the light output of 160 lumens on one watt.
However, some of the state-of-the-art LED bulbs have reached the legendary 200 lumens per watt predicted by Haitz\'s law.
Since LED lights produce more light while using less energy, it is more cost-effective to run.
In addition to saving money, it also means they help our environment by reducing CO2 emissions.
Everyone is well versed in the lumen language and recognizing this, most bulb retailers will include a \"equivalent incandescent wattage\" to simplify things.
In short, this tells the customer the power of an incandescent lamp or halogen lamp designed for replacement by the LED.
For example, the actual wattage of the GU10 LED may be 4 watts, but its equivalent incandescent wattage will be 60 watts, as it produces enough light to replace the halogen lamp of 60 watts.
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