Elara Bennett40 lux corresponds to 40 lumens per square meter multiplied by the area in square meters. Without the area specified, lux cannot be directly converted to lumens. Assuming an area of 1 square meter, 40 lux equals 40 lumens.
Lux measures illuminance, how much luminous flux hits a surface per unit area, while lumens measure total luminous flux emitted by a source. To convert lux to lumens, multiply lux by the area illuminated in square meters.
Conversion Tool
Result in lumens:
Conversion Formula
The formula to convert lux (lx) to lumens (lm) depends on the area (A) over which the light spreads. Lumens measure total light output, while lux measures light per square meter. The formula is:
Lumens (lm) = Lux (lx) × Area (m²)
This works because lux quantifies how many lumens fall on a square meter. So if you know the area illuminated, you multiply lux by it to get total lumens.
Example:
- If a surface has 40 lux and its area is 2 m², then total lumens = 40 × 2 = 80 lumens.
- For 40 lux on 0.5 m² area: lumens = 40 × 0.5 = 20 lumens.
Conversion Example
- Example 1: Convert 25 lux to lumens for 3 m² area
- Step 1: Identify lux value = 25 lx
- Step 2: Identify area = 3 m²
- Step 3: Multiply lux by area: 25 × 3 = 75 lumens
- Example 2: Convert 50 lux on 1.5 m²
- Step 1: Lux = 50 lx
- Step 2: Area = 1.5 m²
- Step 3: Calculation: 50 × 1.5 = 75 lumens
- Example 3: Convert 60 lux for 0.75 m²
- Step 1: Lux = 60 lx
- Step 2: Area = 0.75 m²
- Step 3: Multiply: 60 × 0.75 = 45 lumens
Conversion Chart
| Lux (lx) | Assumed Area (1 m²) | Lumens (lm) |
|---|---|---|
| 15.0 | 1 m² | 15.0 |
| 25.0 | 1 m² | 25.0 |
| 35.0 | 1 m² | 35.0 |
| 45.0 | 1 m² | 45.0 |
| 55.0 | 1 m² | 55.0 |
| 65.0 | 1 m² | 65.0 |
The chart shows lux values converted to lumens assuming the light hits 1 square meter area. To use the chart, if your area differs, multiply the lumens by that area to get total luminous flux.
Related Conversion Questions
- How many lumens are equal to 40 lux on a 5 square meter surface?
- What is the lumen output if 40 lux illuminates a 0.8 m² area?
- Can 40 lux be directly converted to lumens without knowing area?
- How do I calculate lumens from 40 lux in a room measuring 10 m²?
- Does 40 lux lighting produce 40 lumens per square meter?
- What is the difference between 40 lux and 40 lumens?
- How to find total lumens if I have 40 lux intensity and 3 m² area?
Conversion Definitions
Lux: Lux is the unit measuring illuminance, which means how much luminous flux falls on a surface per square meter. It quantifies the perceived brightness over an area, useful in lighting design and measuring light intensity in environments like offices or streets.
Lumens: Lumens measure luminous flux, or the total amount of visible light emitted by a source. It represents brightness output irrespective of direction or area, often used to compare light bulbs or lamps based on how much light they produce.
Conversion FAQs
Can I convert lux to lumens without knowing the area?
No, lux measures light per unit area while lumens measure total light output. Without knowing the surface area illuminated, you can’t convert lux directly to lumens because lumens depend on how large the area receiving the light is.
Why does the area affect conversion from lux to lumens?
Because lux is lumens divided by area, if you increase the area but keep lumens constant, lux decreases. Lumens count total light energy, but lux shows intensity over an area, so area size directly influences the conversion.
What happens if lux value is constant but area changes?
If lux remains constant and area increases, total lumens increase proportionally. For example, 40 lux on 2 m² equals 80 lumens, but on 4 m² equals 160 lumens, reflecting more total light spread over larger surface.
Does the shape of the surface impact conversion?
Lumens depend on total light emitted, lux depends on area. Shape itself doesn’t change conversion if area is same, but uneven surfaces or angles can cause varying lux readings in practice, affecting calculation accuracy.
How accurate is converting assuming 1 m² area?
Assuming 1 m² area simplifies calculations but may mislead if actual area differs. Always use real surface area for correct lumen values from lux to avoid errors in lighting assessments or designs.
