50 lux corresponds to 50 lumens per square meter. Without additional information about the area, converting lux to total lumens assumes a 1 square meter surface, so 50 lux equals 50 lumens.
Lux measures illuminance, meaning the amount of light hitting a surface per unit area, while lumens measure total light output. When the surface area is 1 square meter, lux and lumens share the same numeric value, but for other areas, total lumens equals lux multiplied by the surface area.
Conversion Tool
Result in lumens:
Conversion Formula
The formula to convert lux to lumens depends on the surface area illuminated. Lux (lx) is lumens per square meter (lm/m²). So, total lumens can be found by multiplying lux by the area in square meters:
Lumens = Lux × Area (m²)
This formula works because lux tells how much light falls on each square meter. If you know the total area lighted, multiplying lux by area gives total light output in lumens.
Example: If a surface of 2 m² has an illuminance of 50 lux, the total lumens is:
- 50 lx × 2 m² = 100 lumens
Conversion Example
- Example 1: Convert 30 lux to lumens for a 3 m² area.
- Step 1: Identify lux = 30 lx.
- Step 2: Identify area = 3 m².
- Step 3: Multiply lux by area: 30 × 3 = 90 lumens.
- Example 2: Convert 60 lux to lumens for 0.5 m² area.
- Step 1: Lux = 60 lx.
- Step 2: Area = 0.5 m².
- Step 3: 60 × 0.5 = 30 lumens.
- Example 3: Convert 100 lux to lumens for 4 m².
- Step 1: Lux = 100 lx.
- Step 2: Area = 4 m².
- Step 3: 100 × 4 = 400 lumens.
- Example 4: Convert 45 lux to lumens for 1.5 m².
- Step 1: Lux = 45 lx.
- Step 2: Area = 1.5 m².
- Step 3: 45 × 1.5 = 67.5 lumens.
Conversion Chart
| Lux (lx) | Area (m²) | Lumens (lm) |
|---|---|---|
| 25.0 | 1 | 25.0 |
| 35.0 | 1 | 35.0 |
| 45.0 | 1 | 45.0 |
| 50.0 | 1 | 50.0 |
| 55.0 | 1 | 55.0 |
| 65.0 | 1 | 65.0 |
| 75.0 | 1 | 75.0 |
This chart shows lux values from 25 to 75 for an area of 1 square meter. To find lumens for other areas, multiply the chart value by that area. For example, 50 lux on 2 m² equals 100 lumens.
Related Conversion Questions
- How many lumens are 50 lux over 5 square meters?
- What is the total lumen output if 50 lux illuminates 0.8 m²?
- Does 50 lux always equal 50 lumens?
- How to convert 50 lux to lumens for different room sizes?
- What is the formula to get lumens from 50 lux and area?
- Can I assume 50 lux means 50 lumens without area info?
- How does surface area affect converting 50 lux to lumens?
Conversion Definitions
Lux: Lux is unit measuring illuminance or light intensity on a surface. It equals 1 lumen per square meter. Lux indicates how bright a surface appears under lighting, taking account of light spread over area, not just light output.
Lumens: Lumens measure total quantity of visible light emitted by source. It quantifies brightness from lamp or bulb without considering distance or spread. Lumens help comparing light output independently from power consumption.
Conversion FAQs
Can I convert lux to lumens without knowing the surface area?
No, because lux measures light per square meter, total lumens depends on the area illuminated. Without area, you can only say lumens equals lux times area, but not calculate actual lumens. Assuming 1 m² area is common but not accurate for all cases.
Why does 50 lux equal 50 lumens on 1 m² but not for larger areas?
Because lux is lumens divided by area, so if area is 1 m², lux and lumens numbers match. With larger areas, total lumens increase proportionally, so 50 lux over 3 m² equals 150 lumens, not 50.
What if the area is irregular shape, how to convert lux to lumens?
You can approximate the area in square meters, then multiply by lux value. Irregular shapes require calculating or estimating total surface area to apply the formula lumens = lux × area.
Does the distance from light source affect lux to lumens conversion?
Distance affects lux, because illuminance decreases with distance squared, but lumens measure total emitted light independent of distance. Conversion needs surface area, not distance, but distance affects lux reading.
Are lux and lumens interchangeable?
No, lux and lumens measure different things. Lux measures light intensity on surface; lumens measure total light output. They relate through surface area, but cannot replace each other without context of area.