Elara Bennett1800 lux corresponds to 1800 lumens if the illuminated area is exactly 1 square meter. Lux measures illuminance (lumens per square meter), so when the area is 1 m², lux and lumens have the same numerical value.
Lux is the amount of light falling on a surface per unit area, measured in lumens per square meter. Lumens quantify total visible light emitted. To convert lux to lumens, you multiply by the surface area in square meters because lumens = lux × area.
Conversion Tool
Result in lumens:
Conversion Formula
The formula to convert lux to lumens depends on the surface area illuminated. Lux (lx) is lumens per square meter (lm/m²). So:
Lumens = Lux × Area (in square meters)
This formula works because lux measures how much light hits a surface area, while lumens count total light output. If you know the area, multiplying lux by it gives total lumens.
For example, if 1800 lux falls on 1 m²:
- Lumens = 1800 lx × 1 m² = 1800 lm
If area was 2 m² with same 1800 lux:
- Lumens = 1800 lx × 2 m² = 3600 lm
Conversion Example
- Convert 1500 lux on 2 m² surface:
- Multiply lux by area: 1500 × 2 = 3000 lumens
- This means total light output hitting 2 square meters is 3000 lumens.
- Convert 2000 lux on 0.5 m²:
- 2000 × 0.5 = 1000 lumens
- Less area means less total lumens despite same lux.
- Convert 1750 lux on 3 m²:
- 1750 × 3 = 5250 lumens
- Higher area increases total lumens proportionally.
- Convert 1600 lux on 1.5 m²:
- 1600 × 1.5 = 2400 lumens
- Intermediate area gives lumens between previous examples.
Conversion Chart
| Lux (lx) | Lumens (lm) for 1 m² |
|---|---|
| 1775.0 | 1775.0 |
| 1780.0 | 1780.0 |
| 1785.0 | 1785.0 |
| 1790.0 | 1790.0 |
| 1795.0 | 1795.0 |
| 1800.0 | 1800.0 |
| 1805.0 | 1805.0 |
| 1810.0 | 1810.0 |
| 1815.0 | 1815.0 |
| 1820.0 | 1820.0 |
| 1825.0 | 1825.0 |
The chart shows lux values from 1775 to 1825 with corresponding lumens assuming 1 square meter area. To find lumens for any lux value here, multiply lux by area in square meters.
Related Conversion Questions
- How many lumens equals 1800 lux on a 0.8 square meter surface?
- What is the lumen output if I have 1800 lux over 2 square meters?
- Can I convert 1800 lux directly to lumens without knowing area?
- If I increase area from 1 to 3 m², how lumens changes from 1800 lux?
- What surface area gives 1800 lumens from 1800 lux?
- How does changing the area affect lumens when keeping 1800 lux constant?
- Is 1800 lux more or less bright than 1800 lumens on same surface?
Conversion Definitions
Lux: Lux is a unit measuring illuminance, representing how much visible light falls on a surface per square meter. It quantifies brightness perceived by human eye on a flat area, accounting for light intensity distributed over that space. Higher lux means brighter surface illumination.
Lumens: Lumens measure total visible light output emitted by a source in all directions. It quantifies the amount of light energy perceived by human eye, regardless of area illuminated. Greater lumens correspond to brighter light sources.
Conversion FAQs
Why does the area affect the conversion from lux to lumens?
Lux measures light intensity per unit area, so total light (lumens) depends on how big the surface receiving light is. Without knowing area, you can’t determine total lumens because lux alone only shows density of light, not the quantity emitted or received.
Can lux be converted to lumens if the surface is irregular?
For irregular surfaces, calculating lumens from lux requires knowing the effective illuminated area accurately. Uneven surfaces or angles can affect actual light distribution, making simple multiplication less precise. In such cases, more complex measurements or instruments may be needed.
Is 1800 lux always equal to 1800 lumens?
No, 1800 lux equals 1800 lumens only if the illuminated surface is 1 square meter. If area changes, lumens change proportionally. So without specifying area, you cannot assume lux and lumens are same numerically.
Why use lumens instead of lux for light bulbs?
Lumens indicate total light output from a bulb, useful for comparing brightness of different bulbs regardless of placement. Lux depends on distance and surface area, so it’s better for measuring actual illumination at a location rather than source brightness.
How to measure lux accurately in a room?
Use a lux meter placed at the surface or point of interest, avoiding shadows or reflections. Measure multiple points if light distribution varies. Accurate lux readings help calculate lumens if surface area is known, but errors in measurement can affect conversion accuracy.
