300 lux corresponds to 3000 lumens if the illuminated area is 10 square meters. Lumens measures the total light output, while lux measures the light intensity on a surface.
Lux and lumens relate through the area over which the light spreads. To convert lux to lumens, you multiply the lux value by the surface area in square meters. Without knowing the exact area, lux alone can’t tell the total lumens.
Conversion Tool
Result in lumens:
Conversion Formula
The formula to convert lux to lumens is:
Lumens = Lux × Area (in square meters)
Lux measures how many lumens fall on a square meter. So, multiplying the lux value by the area in square meters gives the total lumens emitted over that area.
For example, if you have 300 lux illuminating a 10 m² area, the total lumens is:
- Calculate: 300 lux × 10 m²
- Result: 3000 lumens
This means the light source emits 3000 lumens to light up the entire 10 square meters at 300 lux intensity.
Conversion Example
- Example 1: 150 lux on 5 m²
- Multiply 150 lux by 5 m²
- 150 × 5 = 750 lumens
- So, the light output is 750 lumens
- Example 2: 400 lux on 8 m²
- 400 × 8 = 3200 lumens
- This shows a bright light covering 8 square meters
- Example 3: 275 lux on 12 m²
- 275 multiplied by 12 equals 3300 lumens
- The total light output over 12 square meters is 3300 lumens
- Example 4: 325 lux on 7 m²
- 325 × 7 = 2275 lumens
- Light output is 2275 lumens
Conversion Chart
| Lux | Lumens (Area = 10 m²) |
|---|---|
| 275.0 | 2750.0 |
| 280.0 | 2800.0 |
| 285.0 | 2850.0 |
| 290.0 | 2900.0 |
| 295.0 | 2950.0 |
| 300.0 | 3000.0 |
| 305.0 | 3050.0 |
| 310.0 | 3100.0 |
| 315.0 | 3150.0 |
| 320.0 | 3200.0 |
| 325.0 | 3250.0 |
The chart shows lumens values for lux values between 275 and 325, assuming a 10 square meter area. To use it, find your lux value in the left column and read the total lumens output on the right.
Related Conversion Questions
- How many lumens correspond to 300 lux in a 15 m² room?
- What area must I assume for converting 300 lux to lumens?
- Is 300 lux a bright light when converted to lumens?
- How does changing the area affect the lumens result from 300 lux?
- Can I convert 300 lux to lumens without knowing the area?
- What is the formula to find lumens from 300 lux on 20 square meters?
- Does 300 lux always equal 300 lumens?
Conversion Definitions
Lux: Lux measures how much luminous flux falls on a surface, per square meter. It quantifies the brightness perceived on the surface, taking into account the area. One lux equals one lumen per square meter, and it helps describe the intensity of light over an area.
Lumens: Lumens measure the total quantity of visible light emitted by a source in all directions. It quantifies the light output without considering direction or area. Higher lumens means brighter light output overall, regardless of where it falls.
Conversion FAQs
Why do I need to know the area to convert lux to lumens?
Because lux measures light per unit area, converting it to total lumens requires multiplying by the area. Without the area, lux alone can’t tell the total light output. The area determines how much surface the light covers, which affects the total lumens.
Can lux ever be greater than lumens?
No, lux and lumens measure different things but their values depends on area. For a fixed lumens output, lux increases as the area decreases, so lux can be numerically larger than lumens if the area is less than 1 m². But they represent different physical quantities.
What happens if I use a wrong area when converting 300 lux to lumens?
Using an incorrect area gives wrong lumens value, misleading about the light output. Since lumens depend on the area, errors in area directly scale the result up or down, causing confusion about brightness or energy consumption.
Is the conversion formula valid for all light sources?
The formula applies regardless of light source, as long as the lux value and area are accurate. It’s a geometric relationship between intensity and total output. But real light distribution may vary, causing some deviation in practical situations.
How precise is the lumens value calculated from lux?
Precision depends on accurate measurement of lux and area. Small errors in either cause proportionate errors in lumens. Also, surface reflectance and angle of light affects lux readings, so conversion results should be treated as estimates unless carefully measured.
Last Updated : 04 July, 2025
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Sandeep Bhandari holds a Bachelor of Engineering in Computers from Thapar University (2006). He has 20 years of experience in the technology field. He has a keen interest in various technical fields, including database systems, computer networks, and programming. You can read more about him on his bio page.