Elara Bennett30 lux is equivalent to 30 lumens per square meter, but to find the total lumens, the area in square meters must be known. For a 1 square meter surface, 30 lux equals 30 lumens. Without area, lux cannot be converted directly to lumens.
Lux measures illuminance, which is lumens spread over an area. Lumens is the total light output, while lux depends on how that light is distributed across a surface. Converting lux to lumens requires multiplying by the surface area in square meters.
Conversion Tool
Result in lumens:
Conversion Formula
The formula to convert lux to lumens depends on the area the light covers. Lux (lx) is lumens per square meter (lm/m²). So, to find lumens (lm), multiply lux by the area (A) in square meters:
Lumens = Lux × Area (m²)
This formula works because lux is a density measure of light, lumens is total light output. If you know how much area is lit, multiplying lux by that area gives total lumens.
Example:
- If you have 30 lux over 2 square meters, lumens = 30 × 2 = 60 lm.
- For 30 lux and 1 m², lumens = 30 × 1 = 30 lm.
Conversion Example
- Convert 45 lux over 3 m²:
- Step 1: Identify lux = 45
- Step 2: Area = 3 m²
- Step 3: Multiply: 45 × 3 = 135 lumens
- Convert 20 lux over 5 m²:
- Step 1: Lux = 20
- Step 2: Area = 5 m²
- Step 3: Multiply: 20 × 5 = 100 lumens
- Convert 10 lux over 0.5 m²:
- Step 1: Lux = 10
- Step 2: Area = 0.5 m²
- Step 3: Multiply: 10 × 0.5 = 5 lumens
- Convert 50 lux over 4 m²:
- Step 1: Lux = 50
- Step 2: Area = 4 m²
- Step 3: Multiply: 50 × 4 = 200 lumens
Conversion Chart
This chart shows lux values from 5.0 to 55.0 and corresponding lumens assuming the area lit is 1 square meter. To find lumens for other areas, multiply the chart value by the area.
| Lux (lx) | Lumens (lm) for 1 m² |
|---|---|
| 5.0 | 5.0 |
| 10.0 | 10.0 |
| 15.0 | 15.0 |
| 20.0 | 20.0 |
| 25.0 | 25.0 |
| 30.0 | 30.0 |
| 35.0 | 35.0 |
| 40.0 | 40.0 |
| 45.0 | 45.0 |
| 50.0 | 50.0 |
| 55.0 | 55.0 |
Related Conversion Questions
- How many lumens are in 30 lux over a 2 square meter area?
- Can I convert 30 lux to lumens without knowing the surface size?
- What is the difference between lux and lumens when measuring light?
- How do I calculate lumens from 30 lux in a room that is 10 m²?
- Does 30 lux always mean 30 lumens regardless of area?
- How does changing the surface area affect lumens if lux is 30?
- What formula should I use to convert 30 lux into total lumens?
Conversion Definitions
Lux: Lux is a measurement of illuminance, indicating how much luminous flux falls on a surface area. Represented as lumens per square meter, it quantifies brightness as perceived by the human eye on a given surface, considering the area illuminated.
Lumens: Lumens measure the total amount of visible light emitted by a source. It represents the perceived power of light to the human eye, without regard to direction or area, indicating overall light output from bulbs or other light sources.
Conversion FAQs
Can I convert lux directly to lumens without knowing the surface area?
No, lux indicates how many lumens spread over 1 square meter. Without the surface area, you can’t find total lumens because lumens equals lux multiplied by area. So, surface size is necessary for accurate conversion.
What happens if the area changes but lux stays the same?
If the area increases while lux remains constant, total lumens increase proportionally. Because lumens = lux × area, a larger surface with same illuminance means more total light is being received.
Is there a standard area assumed when converting lux to lumens?
Sometimes people assume 1 square meter for simplicity, making lux value equal to lumens. But in real situations, knowing actual area is critical for accurate conversion since lux depends on light distribution over that space.
Why is lux used instead of lumens when measuring lighting?
Lux measures how light illuminates surfaces, which is practical for environments and tasks. Lumens measure total light output without area context. For lighting design, lux tells how bright a surface will be, more useful for user experience.
Can lighting conditions affect the lux to lumens relationship?
Yes, factors like reflection, absorption, and distance affect lux levels on surfaces, even with fixed lumens. So lux depends on environment while lumens is a fixed output, meaning conversion can vary in practical settings.
