What impact does luminous efficiency have on lighting?

hall LED Motion Sensor Lights

What is luminous efficiency

In the lighting field luminous efficiency is, optically the effective degree to which a light source converts a unit of electrical power into light output. Luminous efficiency is expressed in lumens per watt (lm/w). Among them, lumens is the unit of measurement of luminous flux. Watt is lamps and lanterns output electric power. Luminous efficiency is an important parameter to measure the efficiency of the light source to convert electrical energy into light energy.
Simple understanding is that the light source in the case of the same power consumption the more luminous flux (lumens), the higher the luminous efficiency. It means that the more efficient the light source is in converting electrical energy into light energy the more energy efficient it is Thus, higher energy efficiency is realized This article will introduce you to the role of luminous efficiency and the luminous efficiency of lighting fixtures. The luminous efficiency of lighting not only affects the efficiency of energy use. It also affects the lighting effect and the concept of environmental protection.

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Luminous efficiency on the impact of lighting

1. Affect the lighting effect and experience

Funny luminous light source, such as LED light fixture, not only has a large lumen output luminous efficacy, the light emitted is uniform and stable, bright, no glare. Traditional lamps and lanterns luminous with delay. Uneven brightness is not enough to produce glare and so on. High luminous efficiency of the light source can provide higher luminous flux. The same power under the light source can illuminate a larger area or provide a higher illumination. This not only enhances the lighting effect but reduces visual fatigue. It improves the user’s visual experience as well.

2. Impact on power consumption

Luminous efficiency directly affects the power consumption of the light source. Specifically as follows: for example, the traditional lamps luminous efficiency in 10-18lm / w, to an 80-watt incandescent lamp, for example, it produces a luminous flux of about 1440lm. LED lamp luminous efficiency of up to 130lm / w or more, to produce a luminous flux of 1440lm only 11 watts of LED light fixture. Electricity consumption is only 1/7 of incandescent lamps, reducing energy consumption by 85%. Obviously, the luminous efficiency of LED light fixture and lanterns greatly reduces the amount of electricity consumption.

3. Lighting cost consumption

High luminous efficiency not only reduces power consumption. It reduces the overall cost of lighting. Due to LED high-efficiency light source long service life. More than 5000 hours. Stability and long life. Maintenance and replacement of low frequency. To make up for ordinary light bulb. Easy to light decay, easy to age low luminous capacity and other shortcomings. Saving electricity and lamps and lanterns maintenance. Replacement costs.

4. Environmental protection

High luminous efficiency lamps and lanterns, not only to save energy consumption, because of its high conversion rate of electric energy, low heat, reducing heat, carbon dioxide and other greenhouse gas emissions, to protect the environment has an important role. Traditional lamps and lanterns usually generate high heat, difficult to maintain a long time lighting work, easy to burn out. High-efficiency and durable LED light fixtures and lanterns reduce waste generation and environmental pollution. Promoting efficient lighting helps achieve energy saving and emissions reduction goals, as well as fostering green development and environmental protection concepts.

5. Light quality

High light source luminous efficiency typically results in better light quality performance, with a higher color rendering index (CRI) offering truer object colors, enhancing comfort and aesthetics of the lighting environment. Modern LED fixtures offer various color temperature options to cater to different scenes, further enhancing the lighting experience.Traditional low luminous efficiency lamps and lanterns, do not have a variety of color temperature adjustment function, relatively single.

6. Impact on lighting safety

High luminous efficiency light source, through advanced optical design, can achieve a more uniform and bright light distribution. Uniform light can reduce the visual fatigue of pedestrians or vehicle drivers, to avoid uneven illumination caused by the blind spot. In addition, LED luminaires operate at low voltage and generate little heat, which, in addition to being environmentally friendly, is also good for safety. Reduces the risk of electric shock and fire. Improve the overall level of safety.


Luminous efficiency is not only the main parameter that determines the efficiency of lighting equipment for the conversion of electrical energy into light energy, luminous efficiency also determines the effect and experience of lighting, energy consumption and lighting costs, which contributes to the development of green environmental protection.LED light fixtures and lanterns, with its efficient luminous efficiency, low energy consumption, long life and dimming function and other diversified designs, in the focus on the efficiency, functionality and experience of the needs of modern lighting to take on an important role. LED’s light emitting technology realizes a more environmentally friendly, economical and comfortable lighting environment.


1. How to calculate luminous efficiency?

The formula for calculating luminous efficiency is: Luminous Efficiency (lm/W) = Luminous Flux (lumens lm) / Electrical Power Consumption (Watts, W). For example if a light bulb has luminous flux of 1300 lumens and an input power of 10 watts, then its luminous efficacy is 130 lm/W.

2. What are the differences in luminous efficacy between different types of light sources?

The luminous efficacy of different types of light sources varies greatly. LEDs have the highest luminous efficacy. They usually range between 80-220 lm/W. Incandescent lamps have low luminous efficacy. It ranges only about 10-20 lm/W.

3. How to maintain the light source to keep its luminous efficiency?

Regular cleaning of lamps helps avoid dust and dirt accumulation. This can maintain luminous efficiency of the light source. In addition choosing a good quality light source and suitable driver power supply will help. Avoiding overuse and frequent switching extends the life of the light source. It maintains its efficient operation. For large lighting systems regular inspection is important. Replacement of aged components is also crucial. These measures maintain high luminous efficiency.

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