Convert illuminance in lux (lx) to luminous flux in lumens (lm) by entering the area in square meters.
Formula:
Lumens (lm) = Lux × Area (m²)The Lux to Lumens Calculator is a valuable tool for converting the amount of light falling on a surface (measured in lux) into the total luminous flux (measured in lumens). This conversion is especially useful for lighting designers, engineers, architects, and anyone involved in assessing or optimizing lighting installations in homes, offices, stadiums, greenhouses, or industrial environments.
Lux (lx) is a unit of illuminance and represents how much light (lumens) is hitting a surface per square meter. It tells you the intensity of light over a given area.
Lumens (lm) measure the total quantity of visible light emitted by a source. While lux measures light on a surface, lumens measure the light output of the source itself.
To convert lux to lumens, you need to know the area the light is illuminating. The formula is:
Lumens = Lux × AreaWhere:
If a room has an illuminance of 300 lux and the area is 10 m², then:
Lumens = 300 × 10 = 3000 lmThis means the light source(s) need to output 3000 lumens to achieve 300 lux in that room.
| Lux | Area (m²) | Lumens |
|---|---|---|
| 100 | 1 | 100 |
| 300 | 5 | 1500 |
| 500 | 10 | 5000 |
| 800 | 12 | 9600 |
| 1000 | 20 | 20000 |
This conversion is commonly used in:
Different environments require different lux levels for optimal visibility and comfort. Here are standard guidelines:
By multiplying these values with the room’s area, you can calculate the ideal total lumens required.
LEDs are widely used for their energy efficiency. Understanding the lux-to-lumens relationship is essential when selecting the correct type and number of LED bulbs. Manufacturers often list lumen outputs, but not always lux ratings, making this calculator crucial for translating real-world lighting needs into purchase decisions.
A: No. Lux is derived from lumens spread over a surface area. If you don’t know the source output or area, you can’t calculate lux directly.
A: Not necessarily. Excessively high lux levels can cause glare, discomfort, or wasted energy. Always match lux levels to the environment’s needs.
A: Measure the length and width of the room or illuminated area in meters. Multiply them to get the area in square meters.
A: Yes. Most light sources gradually lose brightness with usage, especially LEDs, fluorescent, and halogen lights.
A: Yes! Whether you're lighting a backyard, street, or parking lot, you can calculate how many lumens are needed to reach a certain lux level over that space.
Our Lux to Lumens Calculator simplifies your lighting calculations by providing instant, accurate conversions based on your inputs. Whether you're optimizing indoor lighting, planning commercial spaces, or installing smart lighting systems, knowing how many lumens you need based on desired lux levels ensures efficient and comfortable illumination.
Use the calculator above to start converting lux to lumens now and bring precision to your lighting projects.
The Lux to Lumens Calculator is a valuable tool for converting the amount of light falling on a surface (measured in lux) into the total luminous flux (measured in lumens). This conversion is especially useful for lighting designers, engineers, architects, and anyone involved in assessing or optimizing lighting installations in homes, offices, stadiums, greenhouses, or industrial environments.
Lux (lx) is a unit of illuminance and represents how much light (lumens) is hitting a surface per square meter. It tells you the intensity of light over a given area.
Lumens (lm) measure the total quantity of visible light emitted by a source. While lux measures light on a surface, lumens measure the light output of the source itself.
To convert lux to lumens, you need to know the area the light is illuminating. The formula is:
Lumens = Lux × AreaWhere:
If a room has an illuminance of 300 lux and the area is 10 m², then:
Lumens = 300 × 10 = 3000 lmThis means the light source(s) need to output 3000 lumens to achieve 300 lux in that room.
| Lux | Area (m²) | Lumens |
|---|---|---|
| 100 | 1 | 100 |
| 300 | 5 | 1500 |
| 500 | 10 | 5000 |
| 800 | 12 | 9600 |
| 1000 | 20 | 20000 |
This conversion is commonly used in:
Different environments require different lux levels for optimal visibility and comfort. Here are standard guidelines:
By multiplying these values with the room’s area, you can calculate the ideal total lumens required.
LEDs are widely used for their energy efficiency. Understanding the lux-to-lumens relationship is essential when selecting the correct type and number of LED bulbs. Manufacturers often list lumen outputs, but not always lux ratings, making this calculator crucial for translating real-world lighting needs into purchase decisions.
It’s important to understand that while both lux and lumens are used to evaluate light, they serve different purposes. Lux is more practical for measuring lighting on-site, such as at a desk or across a room floor, whereas lumens are useful when comparing different light bulbs or fixtures. As a rule of thumb, always look for lumens on product packaging when buying lights, and use lux measurements when checking how well-lit a space is.
Moreover, lighting planning can also be affected by the directionality of the light. Some lights may produce high lumen values, but if they scatter in all directions without proper focus, the lux level on a specific surface may still be low. This is why lighting fixtures with reflectors or focused optics are often preferred in task lighting scenarios.
In addition, software simulation tools used by architects and lighting professionals often rely on lux values to simulate how lighting behaves in virtual spaces. These tools integrate lux-to-lumen calculations to create realistic light distribution models for interior and exterior designs.
A: No. Lux is derived from lumens spread over a surface area. If you don’t know the source output or area, you can’t calculate lux directly.
A: Not necessarily. Excessively high lux levels can cause glare, discomfort, or wasted energy. Always match lux levels to the environment’s needs.
A: Measure the length and width of the room or illuminated area in meters. Multiply them to get the area in square meters.
A: Yes. Most light sources gradually lose brightness with usage, especially LEDs, fluorescent, and halogen lights.
A: Yes! Whether you're lighting a backyard, street, or parking lot, you can calculate how many lumens are needed to reach a certain lux level over that space.
Our Lux to Lumens Calculator simplifies your lighting calculations by providing instant, accurate conversions based on your inputs. Whether you're optimizing indoor lighting, planning commercial spaces, or installing smart lighting systems, knowing how many lumens you need based on desired lux levels ensures efficient and comfortable illumination.
Use the calculator above to start converting lux to lumens now and bring precision to your lighting projects.