35 lux corresponds to 35 lumens per square meter, but to convert lux to lumens, you need the area size in square meters. Without knowing the area, the lumens cannot be exactly calculated. For example, if the area is 1 square meter, then 35 lux equals 35 lumens.
Lux measures illuminance, which is the amount of light falling on a surface per unit area. Lumens measures luminous flux, total light emitted. To convert lux to lumens, multiply the lux value by the surface area in square meters. This means lumens depend on how large the illuminated area is.
Conversion Tool
Result in lumens:
Conversion Formula
The formula to convert lux (lx) to lumens (lm) depends on the surface area (A) in square meters:
Lumens = Lux × Area
This works because lux measures luminous flux per unit area. If you know how many lux are shining on a surface of a known size, multiply that illuminance by the surface area to get the total lumens illuminating it.
Example:
- Given: 35 lux and an area of 2 m²
- Calculate: Lumens = 35 × 2 = 70 lumens
- This means 70 lumens of light are spreading over that 2 m² surface.
Conversion Example
- Convert 50 lux on a 3 m² surface:
- Multiply lux by area: 50 × 3 = 150 lumens
- This means the surface receives 150 lumens in total.
- Convert 20 lux on 0.5 m²:
- 20 × 0.5 = 10 lumens
- The smaller area means fewer lumens total despite the lux value.
- Convert 100 lux on 1.5 m²:
- 100 × 1.5 = 150 lumens
- More area means more total light energy.
- Convert 10 lux on 4 m²:
- 10 × 4 = 40 lumens
- Low illuminance but larger area still creates moderate lumens.
- Convert 75 lux on 0.8 m²:
- 75 × 0.8 = 60 lumens
- Multiplying lux by area always gives you lumens.
Conversion Chart
Lux (lx) | Area (m²) | Lumens (lm) |
---|---|---|
10.0 | 1 | 10.0 |
20.0 | 1 | 20.0 |
30.0 | 1 | 30.0 |
40.0 | 1 | 40.0 |
50.0 | 1 | 50.0 |
60.0 | 1 | 60.0 |
This chart assumes the surface area is 1 square meter, so lux values equal lumens directly. To find lumens for a different area, multiply the lux value in the chart by the desired area. Use the chart to quickly see how lux converts to lumens for small areas.
Related Conversion Questions
- How many lumens does 35 lux produce on a 5 square meter surface?
- What is the lumen output for 35 lux in a 0.2 m² room?
- Can I convert 35 lux to lumens without knowing the surface area?
- How do I calculate total lumens from 35 lux lighting?
- Does 35 lux equal 35 lumens always?
- What formula to use to convert 35 lux to lumens for any area?
- If I have 35 lux on 10 m², how many lumens is that?
Conversion Definitions
Lux: Lux is the unit measuring illuminance, quantifying how much luminous flux lands on a surface per square meter. It tells how bright the surface appears when light is shining on it, considering both the intensity and the distribution of light over area.
Lumens: Lumens measure luminous flux, which is the total amount of visible light emitted by a source. This unit reflects the overall brightness perceived by the human eye, regardless of the direction or spread of the light.
Conversion FAQs
Can I convert lux to lumens without knowing the surface area?
No, converting lux to lumens requires the surface area illuminated because lux represents light per square meter, while lumens is the total light output. Without area, the total lumens can’t be determined from lux alone.
Does the conversion change with different types of lighting?
The conversion formula stays the same, but the distribution of light affects the lux reading. Different lights might produce the same lumens but spread differently, causing varying lux values on surfaces.
What happens if the surface isn’t flat or uniform?
Since lux measures light per unit area, uneven or curved surfaces can cause inaccurate lux readings, making lumens calculations less precise. Measuring average illuminance over the area helps improve accuracy.
Is 35 lux considered bright for indoor lighting?
35 lux is quite dim for most indoor activities like reading or working. Indoor lighting usually requires higher lux levels, but 35 lux might be suitable for ambient or mood lighting.
How accurate is the formula for large outdoor areas?
For large or irregular outdoor spaces, measuring exact surface area can be tricky, and varying light conditions cause fluctuating lux. The formula gives an estimate, but actual lumens may differ due to environmental factors.