The conversion of 100 lux to lumens depends on the area over which the lux is measured. Assuming an area of 1 square meter, 100 lux equals 100 lumens.
Lux measures illuminance, or light intensity per unit area, while lumens measure total light output. To convert lux to lumens, multiply lux by the area in square meters. Without specifying the area, the conversion cannot be exact.
Conversion Tool
Result in lumens:
Conversion Formula
To convert lux to lumens, the formula is:
Lumens = Lux × Area (in square meters)
Lux measures how much light falls on a surface per square meter. Lumens measure the total amount of visible light emitted by a source. By multiplying the lux by the surface area, you find the total lumens illuminating that area.
Example: If an area of 2 square meters is lit with 100 lux, the calculation is:
- 100 lux × 2 m² = 200 lumens
This means the total light output hitting that 2 m² surface is 200 lumens.
Conversion Example
- Convert 50 lux over 3 m²:
- Multiply 50 by 3
- 50 × 3 = 150 lumens
- So 50 lux over 3 m² equals 150 lumens total.
- Convert 120 lux over 0.5 m²:
- 120 × 0.5 = 60 lumens
- Light intensity is less because area is smaller but lux is higher.
- Convert 80 lux over 4 m²:
- 80 × 4 = 320 lumens
- More area means more total lumens given same lux.
- Convert 200 lux over 1.5 m²:
- 200 × 1.5 = 300 lumens
- Higher lux and moderate area results in 300 lumens.
Conversion Chart
| Lux | Lumens (assuming 1 m²) |
|---|---|
| 75.0 | 75.0 |
| 80.0 | 80.0 |
| 85.0 | 85.0 |
| 90.0 | 90.0 |
| 95.0 | 95.0 |
| 100.0 | 100.0 |
| 105.0 | 105.0 |
| 110.0 | 110.0 |
| 115.0 | 115.0 |
| 120.0 | 120.0 |
| 125.0 | 125.0 |
This chart shows lux values from 75 to 125, converted to lumens assuming the area is 1 square meter. You can read the chart by matching the lux value to the equivalent lumens for that area. For other areas, multiply the lumens by the area in m².
Related Conversion Questions
- How many lumens do 100 lux produce on a 2 square meter surface?
- What is the difference between 100 lux and 100 lumens in lighting?
- Can 100 lux be directly converted to lumens without knowing the area?
- How to calculate lumens from lux for a room of 10 square meters?
- Is 100 lux a bright enough light intensity in terms of lumens?
- How does changing the area affect the conversion of 100 lux to lumens?
- Why does 100 lux equal 100 lumens only at 1 square meter area?
Conversion Definitions
Lux: Lux is a unit measuring illuminance, representing the amount of visible light that falls on a surface per square meter. It quantifies how bright the surface appears, taking into account both the light source intensity and distance from the surface. It’s used in lighting design and measurement.
Lumens: Lumens measure the total quantity of visible light emitted by a source in all directions. It represents the brightness perceived by human eyes from the source, without considering how it’s distributed over an area. Lumens help to compare light bulbs and their output.
Conversion FAQs
Can I convert lux to lumens without knowing the surface area?
You cannot accurately convert lux to lumens without the surface area because lux measures light per unit area, while lumens measure total light output. Without knowing the size of the area, the total lumens can’t be calculated from lux alone.
What happens if the surface is not flat or uniform when converting lux to lumens?
If the surface is uneven or angled, the lux measurement may vary across it, making the conversion to lumens less precise. The formula assumes uniform illumination and flat area; irregular surfaces require more complex calculations or measurements.
Does the color of the surface affect lux to lumens conversion?
Color and reflectivity affect how much light is absorbed or reflected, but lux measures light falling on the surface regardless of color. However, perceived brightness may change. Lumens measure emitted light, so surface properties don’t change the conversion itself.
Is 100 lux bright enough for reading in terms of lumens?
100 lux on a 1 m² area equals 100 lumens, which is on the low end for reading tasks. Typical reading requires around 300-500 lux, or 300-500 lumens over that area, to avoid eye strain and ensure comfortable visibility.
Why does the conversion assume 1 square meter area?
Assuming 1 square meter simplifies the conversion because lux equals lumens per square meter. Without an area value, 1 m² is the default for direct conversion, but for other areas, multiply the lux by the actual surface to get lumens.
