50 lux corresponds to 500 lumens assuming the illuminated surface area is 10 square meters. This conversion depends on the area over which the light is spread, so without knowing the area, lux alone cannot give lumens directly.
Lux measures illuminance, or light intensity on a surface, while lumens measure total light output. To convert lux to lumens, multiply the lux value by the surface area in square meters that the light covers. For example, if 50 lux shines on 10 m², the total lumens is 50 × 10 = 500 lumens.
Conversion Tool
Result in lumens:
Conversion Formula
The formula to convert lux (lx) to lumens (lm) requires multiplying the lux value by the surface area in square meters (m²) where the light falls:
Lumens (lm) = Lux (lx) × Area (m²)
This works because lux measures how many lumens spread over one square meter. So, when you multiply the lux by the total area, you get the total lumens illuminating that surface.
For example, if the illuminance is 50 lux over 10 m²:
- Multiply 50 (lux) by 10 (m²)
- 50 × 10 = 500 lumens
- This means the light source emits 500 lumens over that area
Conversion Example
- Example 1: 30 lux on 8 m²
- 30 × 8 = 240 lumens
- So, 30 lux over 8 square meters equals 240 lumens
- Example 2: 100 lux on 5 m²
- 100 × 5 = 500 lumens
- Light intensity of 100 lux spread over 5 m² results in 500 lumens
- Example 3: 75 lux on 12 m²
- 75 × 12 = 900 lumens
- This means 75 lux lighting an area of 12 square meters equals 900 lumens
- Example 4: 60 lux on 15 m²
- 60 × 15 = 900 lumens
- Here, 60 lux over 15 m² corresponds to 900 lumens
Conversion Chart
| Lux (lx) | Area (m²) | Lumens (lm) |
|---|---|---|
| 25.0 | 10 | 250.0 |
| 30.0 | 10 | 300.0 |
| 35.0 | 10 | 350.0 |
| 40.0 | 10 | 400.0 |
| 45.0 | 10 | 450.0 |
| 50.0 | 10 | 500.0 |
| 55.0 | 10 | 550.0 |
| 60.0 | 10 | 600.0 |
| 65.0 | 10 | 650.0 |
| 70.0 | 10 | 700.0 |
| 75.0 | 10 | 750.0 |
The chart shows how different lux values convert into lumens when the surface area is 10 square meters. To find lumens for other areas, multiply the lumens here by the ratio of your area over 10.
Related Conversion Questions
- How many lumens do 50 lux produce over 5 square meters?
- What is the lumen output for 50 lux lighting a 20 m² room?
- Can I convert 50 lux to lumens without knowing the surface area?
- Why does the area affect converting 50 lux to lumens?
- Is 50 lux equal to 500 lumens for all surface sizes?
- How do I calculate lumens from 50 lux for irregular areas?
- What formula should I use to convert 50 lux into lumens?
Conversion Definitions
Lux: Lux is a unit measuring illuminance, which tells how much light falls on a surface per square meter. One lux equals one lumen per square meter. It indicates the intensity of light perceived by the human eye on a specific area, useful for assessing brightness in rooms or workplaces.
Lumens: Lumens measure the total amount of visible light emitted by a source. Unlike lux, which depends on area, lumens quantify overall light output regardless of direction or surface. Higher lumens mean brighter light emitted from bulbs, LEDs, or other lighting devices.
Conversion FAQs
Can I convert lux to lumens without knowing the surface area?
No, lux measures illuminance per unit area, so surface size is required to find total lumens. Without area, converting lux directly to lumens isn’t possible because lumens represent total light output, and lux is light intensity on a surface.
Why does the surface area affect the conversion from lux to lumens?
Because lux equals lumens spread over one square meter, the total lumens changes with area size. Larger areas receiving same lux means more total light (lumens), while smaller areas have fewer lumens for the same lux reading.
What assumptions are made when converting 50 lux to 500 lumens?
The conversion assumes the light uniformly covers a 10-square-meter area. If the area is different, the total lumens will change. The 50 lux value alone does not indicate lumens without knowing how large the illuminated surface is.
How accurate is converting lux to lumens using a fixed area?
Using a fixed area provides an estimate but cannot account for uneven lighting, shadows, or reflective surfaces. For precise lumens, measurements must consider light distribution and actual surface size, not just lux and area.
Is lux always lower than lumens?
Lux and lumens measure different things, so one isn’t inherently higher or lower. Lux depends on lumens and area, so a small area with lots of lumens can have high lux, while large area with same lumens results in lower lux.
