The conversion of 200 lux to lumens depends on the surface area illuminated. Assuming 1 square meter, 200 lux equals 200 lumens. This means that if a surface of 1 square meter is illuminated with 200 lux, the total luminous flux hitting that area is 200 lumens.
Lux measures illuminance, the amount of light per unit area, while lumens measure total light output. To convert lux to lumens, multiply the lux value by the surface area in square meters where the light is distributed. Without knowing the area, lux alone can’t give the lumens directly.
Conversion Tool
Result in lumens:
Conversion Formula
The formula to convert lux to lumens links illuminance and luminous flux by area:
Lumens (lm) = Lux (lx) × Area (m²)
This works because lux quantifies how much light falls on a surface, lumens quantify total emitted light. If you know how big the surface is, then multiplying lux by area gives total lumens.
Example:
- Given 200 lux over 1 square meter
- Multiply: 200 lx × 1 m² = 200 lm
- So, 200 lux corresponds 200 lumens over 1 square meter
Conversion Example
- 150 lux over 2 m²:
- Multiply lux by area: 150 × 2 = 300 lumens
- This means 300 lumens of luminous flux cover 2 square meters at 150 lux
- 250 lux over 0.5 m²:
- Calculation: 250 × 0.5 = 125 lumens
- Luminous flux here is 125 lumens on 0.5 square meters
- 100 lux over 3 m²:
- 100 × 3 = 300 lumens
- This means total 300 lumens illuminating an area of 3 square meters
- 180 lux over 1.5 m²:
- 180 × 1.5 = 270 lumens
- So, 270 lumens distributed across 1.5 square meters
Conversion Chart
| Lux (lx) | Lumens (lm) (Area = 1 m²) |
|---|---|
| 175.0 | 175.0 |
| 180.0 | 180.0 |
| 185.0 | 185.0 |
| 190.0 | 190.0 |
| 195.0 | 195.0 |
| 200.0 | 200.0 |
| 205.0 | 205.0 |
| 210.0 | 210.0 |
| 215.0 | 215.0 |
| 220.0 | 220.0 |
| 225.0 | 225.0 |
The chart shows lumens values for lux between 175 and 225, assuming the light is spread over 1 square meter. To find lumens for any lux in this range, simply look up the lux value, the lumens are the same number times 1 m². For other areas, multiply accordingly.
Related Conversion Questions
- How many lumens are in 200 lux for a 2 square meter surface?
- What is the formula to convert 200 lux to lumens on 0.75 m²?
- If a room has 200 lux lighting, how to calculate total lumens?
- Can 200 lux be converted to lumens without knowing the area?
- How does surface size affect lumens when converting from 200 lux?
- What is the lumens output of 200 lux over 3 square meters?
- Why does 200 lux equal different lumens depending on area?
Conversion Definitions
Lux: Lux is a unit measuring illuminance, representing how much luminous flux falls on a surface area. One lux equals one lumen per square meter. It quantifies brightness perceived by the human eye on a surface, used in lighting design and photography.
Lumens: Lumens measure luminous flux, the total quantity of visible light emitted by a source. It indicates the total amount of light energy produced, regardless of direction or area covered, essential for describing bulb brightness.
Conversion FAQs
Does the area always have to be 1 square meter to convert lux to lumens?
No, the area does not always have to be 1 square meter. Lux measures light per unit area, so to find total lumens, multiply lux value by the surface area in square meters. If area varies, lumens will change accordingly.
What happens if the illuminated surface is irregular or curved?
When the surface is irregular or curved, calculating lumens from lux becomes more complex. The effective area exposed to light may differ, requiring integration over the surface shape. Simple multiplication works best for flat surfaces.
Can lux values be used directly to compare light bulb brightness?
Not exactly. Lux depends on distance and area illuminated, while lumens indicate total light output. Comparing brightness of bulbs is better done using lumens instead of lux, because lux varies with environment setup.
Why does converting 200 lux sometimes give different lumens in different situations?
Because lumens depend on how large the surface is that lux is measured on. 200 lux over 1 m² equals 200 lumens, but over 2 m² it equals 400 lumens. The surface area changes total luminous flux, affecting lumens results.
Is the conversion formula valid for outdoor light measurements?
The formula applies to any situation if surface area is known, including outdoor settings. However, outdoor light can scatter or absorb, making exact area estimation difficult, so lumens calculation might be less precise.
