Understand What Light Efficiency Is

At some point, while looking for the best bulb to make an exchange at home, you must have come across the term luminous efficiency. But do you know what this information means?

Understand What Light Efficiency Is

Understanding this kind of data helps you to make the best choice so that you have good lighting and low energy consumption in your home or workplace.

Find out in our post all about light efficiency and how much it can tell you about a light bulb!

WHAT ARE THE MAGNITUDES INVOLVED?

Basically, the measure considers two units. One is relatively common to people’s daily lives – power – and the other, somewhat lesser known – lumens.

Power is nothing more than the amount of energy – in this case, electrical energy – needed to power any electrical and electronic equipment.

Lumens are the unit of measure that expresses the amount of light that an artificial source can emit, when triggered.

WHAT IS LIGHT EFFICIENCY?

It is the ratio of the luminous flux, measured in lumens, and the energy power, measured in watts. In other words, luminous efficiency measures how much electrical energy is actually converted into illumination during the operation of a light bulb.

Paying attention to this parameter makes a difference in the energy savings you will have in lighting that environment and, consequently, in the value of the end-of-month account. Family or business budget thanks!

HOW TO MEASURE THIS GREATNESS?

It is possible to find the value of luminous efficiency by means of a simple division operation: the luminous flux divided by the power demanded by the lamp, finding a value in the unit of lumens per Watts (Lm / W).

For comparison purposes, the luminous efficiency of a fluorescent lamp is around 50 to 70 Lm / W, whereas in LED lamps we find values usually above 100 Lm / W. Briefly, the higher the efficiency, the greater the light output, and the better the operating stability.

This means that by comparing lamp types, fluorescents provide much more light, requiring less power than an incandescent bulb. In turn, the LEDs deliver even more intense illumination, using only a small portion of the power required by a fluorescent.

WHAT INFLUENCES THE LUMINOUS EFFICIENCY OF A LAMP?

The most important factors are the size, design and, above all, the technology used in the device. As we have seen, in the comparison between incandescent, fluorescent and LEDs, the evolution of the mechanism that generates light emission was decisive to increase the value of luminous efficiency and the amount of lumens emitted and the reduction of the power needed to achieve those results.

This information is usually included in energy performance labels, not only bulbs, but also most of the electronic equipment marketed in Brazil in recent years, since the label was implemented as mandatory.

WHAT CAN THIS INFORMATION CONTRIBUTE TO?

It is simple: in choosing the lamps you will buy! So in addition to comparing prices, you can make sure that you are not switching from a high-efficiency model to a very inefficient model that will not perform its function properly, from visual discomfort to productivity drop or attention level .

To say that two lamps have a similar level of luminous efficiency is to say that they illuminate equally well. If the value of one is higher than the value of another, it is more efficient and therefore should be chosen.

By national standards, LED bulbs must contain a very complete label that also includes this value of luminous efficiency, demonstrating that it has been properly tested and approved by INMETRO (National Institute of Metrology, Quality and Technology).

Therefore, always prefer certified products in order to ensure the safety and quality of LED technology in your installation and operation.

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