1800 lux equals 1800 lumens assuming the illuminated area is exactly 1 square meter. This is because lux measures luminous flux per unit area, so when the area is 1 square meter, lux and lumens have the same numeric value.
Lux is the measure of illumination intensity on a surface, while lumens measure the total light emitted by a source. Since lux = lumens / area (in square meters), if the area is 1 m², then 1800 lux corresponds to 1800 lumens.
Conversion Tool
Result in lumens:
Conversion Formula
The formula to convert lux to lumens is:
Lumens = Lux × Area
Lux indicates how much luminous flux hits a surface per square meter. Lumens represent the total light output from the source. To find lumens from lux, you need the area the light covers, measured in square meters. If the area is 1 m², then lux and lumens values are equal.
For example, if an area of 2 m² receives 900 lux, then the total lumens is:
- Calculate: Lumens = 900 lux × 2 m²
- Result: 1800 lumens
Conversion Example
- Convert 1500 lux to lumens, assuming an area of 1 m²:
- Multiply: 1500 lux × 1 m²
- Result: 1500 lumens
- Convert 2400 lux over 0.5 m²:
- Multiply: 2400 × 0.5
- Result: 1200 lumens
- Convert 3000 lux over 3 m²:
- Multiply: 3000 × 3
- Result: 9000 lumens
- Convert 1000 lux with 2.5 m²:
- Multiply: 1000 × 2.5
- Result: 2500 lumens
Conversion Chart
| Lux | Lumens (for 1 m² area) |
|---|---|
| 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 |
This chart shows lux values between 1775 and 1825, converted to lumens assuming the area is 1 square meter. To use it, find the lux value and read across to see the corresponding lumens for that same area.
Related Conversion Questions
- How many lumens are in 1800 lux on a 2 square meter surface?
- What’s the total lumen output if 1800 lux is measured over 0.75 m²?
- Can 1800 lux be converted directly to lumens without knowing area?
- If a lamp emits 1800 lumens, what is illumination in lux over 1 m²?
- How to calculate lumens from 1800 lux in a room of 3 square meters?
- Does 1800 lux always mean 1800 lumens regardless of area?
- What is the formula to convert 1800 lux to lumens for different surface sizes?
Conversion Definitions
Lux: Lux measures the intensity of light hitting a surface, calculated as lumens per square meter. It shows how bright an area appears to human eyes, factoring the size of the surface illuminated. Lux is useful in lighting design and measuring indoor illumination levels.
Lumens: Lumens quantify the total amount of visible light emitted by a source. Unlike lux, which depends on area, lumens represent the overall light output regardless of where it lands. Lumens help compare brightness between different bulbs or lighting fixtures.
Conversion FAQs
Why does the area matter when converting lux to lumens?
Lux measures light per unit area, so to find total light output (lumens), you multiply by the surface size illuminated. Without knowing the area, you can’t determine lumens accurately because the same lux value can correspond to different lumen totals depending on how big the lighted area is.
Is it possible to convert from lumens to lux without area?
No, converting lumens to lux requires the knowledge of the surface area illuminated. Since lux equals lumens divided by area, without the area value, the lux cannot be calculated from lumens alone.
Does 1800 lux always equal 1800 lumens?
Only if the illuminated surface is exactly 1 square meter. If the area changes, the lumens value will change proportionally. So 1800 lux on 2 m² means 3600 lumens total, not 1800.
Can lux be higher than lumens?
Lux can appear numerically higher if the illuminated area is less than one square meter, because lux is lumens divided by area. So, if the area is less than 1 m², the lux value will be greater than the lumen value.
Why is lux used instead of lumens for measuring room brightness?
Lux indicates how much light actually reaches surfaces and eyes, factoring area, which is more practical for evaluating lighting conditions in spaces. Lumens only show total light output, so lux better reflects perceived brightness within a given environment.
