50 lux corresponds to 50 lumens when the illuminated surface area is exactly 1 square meter. This means that under such area, the total luminous flux is 50 lumens.
Lux measures illuminance, or luminous flux per unit area, while lumens measure total luminous flux emitted by a source. To convert lux to lumens, you multiply lux by the area in square meters. So, for 50 lux on 1 m², the total lumens is 50 × 1 = 50 lumens.
Conversion Tool
Result in lumens:
Conversion Formula
The formula to convert lux to lumens depends on the surface area illuminated:
Lumens = Lux × Area (in square meters)
This formula means that if you know the illuminance (lux) and the area over which it spreads, you can find the total luminous flux in lumens. Lux is lumens per square meter, so multiplying lux by area cancels the square meters unit, leaving lumens.
Example calculation:
- Given lux = 50
- Area = 1 m²
- Lumens = 50 × 1 = 50 lumens
If the area was 2 m², then lumens = 50 × 2 = 100 lumens, showing how area impacts lumens.
Conversion Example
- Example 1: 30 lux on 2 m²
- Multiply 30 lux by 2 m²
- 30 × 2 = 60 lumens
- The total luminous flux is 60 lumens
- Example 2: 75 lux on 0.5 m²
- Calculate 75 × 0.5
- Result is 37.5 lumens
- So, 37.5 lumens are emitted over that 0.5 m² area
- Example 3: 100 lux over 3 m²
- Multiply 100 by 3
- Result is 300 lumens
- This means 300 lumens illuminate the 3 m² surface
- Example 4: 45 lux on 1.5 m²
- 45 × 1.5 = 67.5 lumens
- A total of 67.5 lumens are present
Conversion Chart
| Lux (lx) | Lumens (lm) at 1 m² |
|---|---|
| 25.0 | 25.0 |
| 30.0 | 30.0 |
| 35.0 | 35.0 |
| 40.0 | 40.0 |
| 45.0 | 45.0 |
| 50.0 | 50.0 |
| 55.0 | 55.0 |
| 60.0 | 60.0 |
| 65.0 | 65.0 |
| 70.0 | 70.0 |
| 75.0 | 75.0 |
The chart shows the lumens values for lux readings from 25 to 75, assuming the illuminated area is 1 square meter. You read across lux values in the first column, then see the corresponding lumens in the second. This helps quick reference without calculation.
Related Conversion Questions
- How many lumens are equivalent to 50 lux on 2 square meters?
- What is the lumen output if I have 50 lux over a 0.8 m² area?
- Can 50 lux be converted directly to lumens without knowing the area?
- How do I calculate lumens from 50 lux in a room of 5 m²?
- Is 50 lux the same as 50 lumens for any surface size?
- What formula should I use to convert 50 lux to lumens?
- If I double the area from 1 m² to 2 m² at 50 lux, what happens to lumens?
Conversion Definitions
Lux: Lux is a unit measuring illuminance, telling how much luminous flux falls on a square meter of surface. It’s lumens per square meter, so it describes brightness as perceived on surfaces, not the total light output from a source.
Lumens: Lumens quantify total luminous flux emitted by a light source, showing how much visible light is emitted. It measures overall light output regardless of direction or area illuminated.
Conversion FAQs
Can I convert lux to lumens without knowing the surface area?
No, you cannot convert lux directly to lumens without knowing the area because lux measures light per unit area. Lumens depend on total area illuminated, so without area, the total luminous flux remains unknown.
Why does the area affect the conversion between lux and lumens?
Lux is lumens divided by area, so when you convert lux back to lumens, you multiply lux by area. Larger areas with same lux means more total light (lumens), smaller areas means less total light.
Is the conversion formula different indoors versus outdoors?
The formula itself does not change indoors or outdoors. However, real-world factors like light scattering, reflection, or obstruction can affect measurements but the conversion between lux and lumens remains lux × area.
What if the illuminated area isn’t flat or uniform?
If the area is irregular or not flat, lux readings can vary across surfaces, so averaging lux over the total area is necessary to estimate lumens. Uneven lighting can complicate exact conversions.
Are lumens always higher than lux values?
Not necessarily. Lumens and lux measure different things. Lumens is total light output, lux is light per unit area. If area is less than 1 m², lumens can be less than lux value, if area is more than 1 m², lumens will be higher.
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