30 lux equals 30 lumens per square meter. To convert 30 lux into lumens, you need to multiply by the surface area in square meters that the light is falling on, since lux measures illuminance and lumens measure luminous flux.
Lux measures the intensity of light on a surface, while lumens measures the total amount of visible light emitted by a source. Without knowing the area, lux can’t directly convert to lumens. If we assume the area is 1 square meter, then 30 lux equals 30 lumens.
Conversion Tool
Result in lumens:
Conversion Formula
The formula to convert lux to lumens depends on the area the light illuminates, because lux measures light intensity per square meter, and lumens measure total light output.
Formula: Lumens (lm) = Lux (lx) × Area (m²)
This works because lux tells how many lumens fall on each square meter. To get total lumens, multiply lux by the surface area in square meters. Without area, lux can’t be turned into lumens directly.
Example: Suppose an area of 2 square meters is lit at 30 lux. The total lumens is:
- Lux = 30 lx
- Area = 2 m²
- Lumens = 30 × 2 = 60 lm
Conversion Example
- Convert 15 lux to lumens for 3 m² area:
- Given lux = 15 lx
- Area = 3 m²
- Lumens = 15 × 3 = 45 lm
- Convert 50 lux to lumens for 0.5 m² area:
- Lux = 50 lx
- Area = 0.5 m²
- Lumens = 50 × 0.5 = 25 lm
- Convert 40 lux to lumens for 1.2 m² area:
- Lux = 40 lx
- Area = 1.2 m²
- Lumens = 40 × 1.2 = 48 lm
- Convert 25 lux to lumens for 4 m² area:
- Lux = 25 lx
- Area = 4 m²
- Lumens = 25 × 4 = 100 lm
Conversion Chart
| Lux (lx) | Lumens (lm) for 1 m² area |
|---|---|
| 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 |
This chart shows how many lumens corresponds to each lux value, assuming the surface area is 1 square meter. To find lumens for other areas multiply the chart value by the area in square meters.
Related Conversion Questions
- How many lumens are in 30 lux for a 2 square meter area?
- Can I convert 30 lux directly into lumens without knowing area?
- What is the lumens value of 30 lux over 0.75 m²?
- How does surface area affect converting 30 lux to lumens?
- Is 30 lux equal to 30 lumens on any surface size?
- What formula to use for converting 30 lux to lumens?
- How to calculate lumens from 30 lux in a 5 m² room?
Conversion Definitions
Lux: Lux is a unit measuring illuminance, which means the amount of visible light falling on a surface per unit area, measured in lumens per square meter. It describes how bright the surface appears to the human eye under a given lighting condition.
Lumens: Lumens measure luminous flux, or the total quantity of visible light emitted by a source per second. It quantifies how much light a bulb or fixture produces, regardless of the area it covers or distance it travels.
Conversion FAQs
Why can’t I convert lux to lumens without knowing the surface area?
Lux measures light intensity per square meter; without the area, you only know how bright one meter squared is, not the total light emitted. Lumens depend on total light output, so the surface area must be known to calculate lumens from lux.
Does the color of light affect lux to lumens conversion?
No. Lux and lumens measure visible light quantity and intensity but do not account for color. The conversion formula depends only on area and lux value, not on light wavelength or color temperature.
What if the surface is irregular or curved?
Calculating lumens from lux assumes a flat surface area. For curved or uneven surfaces, the actual illuminated area can be hard to measure precisely, making direct conversion less accurate without detailed geometry.
Can lumens be higher than lux for the same measurement?
They measure different things, so lumens often are numerically higher because they count total light output, while lux divides that by area. A high lumen source over large area results in lower lux, but lumens remain total light count.
Is the conversion formula different outdoors?
The formula stays same indoors or outdoors, but factors like distance, reflection, and atmospheric conditions affect lux readings. Lumens measure total output, so conversion always needs area, but environmental factors can change perceived illuminance.