1200 lux equals 1200 lumens when the illuminated surface area is 1 square meter.
Lux measures illuminance, which is lumens per square meter. To convert lux to lumens, you multiply the lux value by the surface area in square meters where the light falls. Without knowing the area, lux can’t be directly converted to lumens.
Conversion Tool
Result in lumens:
Conversion Formula
The formula to convert lux (lx) to lumens (lm) depends on the area illuminated. Lux is lumens per square meter, so:
Lumens (lm) = Lux (lx) × Area (m²)
This works because lux measures how many lumens fall on one square meter. If you know the area in square meters where the light is spread, multiplying lux by area gives total lumens.
For example, if a light shines at 1200 lux on a 1 m² surface:
- Lux = 1200 lx
- Area = 1 m²
- Lumens = 1200 × 1 = 1200 lm
Conversion Example
- Example 1: Convert 500 lux to lumens on 2 m² surface
- Lux = 500 lx
- Area = 2 m²
- Lumens = 500 × 2 = 1000 lm
- Example 2: Convert 2500 lux to lumens on 0.5 m² surface
- Lux = 2500 lx
- Area = 0.5 m²
- Lumens = 2500 × 0.5 = 1250 lm
- Example 3: Convert 1000 lux to lumens on 1.2 m² surface
- Lux = 1000 lx
- Area = 1.2 m²
- Lumens = 1000 × 1.2 = 1200 lm
- Example 4: Convert 750 lux to lumens on 3 m² surface
- Lux = 750 lx
- Area = 3 m²
- Lumens = 750 × 3 = 2250 lm
Conversion Chart
The table below shows lux values between 1175.0 and 1225.0 converted to lumens, assuming the light covers 1 square meter. You can use it to quickly estimate lumens for lux values in this range.
| Lux (lx) | Lumens (lm) |
|---|---|
| 1175.0 | 1175.0 |
| 1177.5 | 1177.5 |
| 1180.0 | 1180.0 |
| 1182.5 | 1182.5 |
| 1185.0 | 1185.0 |
| 1187.5 | 1187.5 |
| 1190.0 | 1190.0 |
| 1192.5 | 1192.5 |
| 1195.0 | 1195.0 |
| 1197.5 | 1197.5 |
| 1200.0 | 1200.0 |
| 1202.5 | 1202.5 |
| 1205.0 | 1205.0 |
| 1207.5 | 1207.5 |
| 1210.0 | 1210.0 |
| 1212.5 | 1212.5 |
| 1215.0 | 1215.0 |
| 1217.5 | 1217.5 |
| 1220.0 | 1220.0 |
| 1222.5 | 1222.5 |
| 1225.0 | 1225.0 |
Related Conversion Questions
- How do you convert 1200 lux to lumens if the surface area is 2 square meters?
- What is the lumens output of a 1200 lux light over 0.75 m²?
- Can 1200 lux be directly converted to lumens without knowing the area?
- How many lumens correspond to 1200 lux on 5 square meters?
- Is 1200 lux equal to 1200 lumens for any surface size?
- What formula to use to find lumens from 1200 lux?
- If a room is lit at 1200 lux, how to calculate total lumens needed?
Conversion Definitions
Lux: Lux is a measure of illuminance, quantifying how much luminous flux is spread over a square meter of surface area. It shows how bright a surface appears to the human eye, taking into account both the light intensity and the area it covers, expressed in lumens per square meter.
Lumens: Lumens measure the total amount of visible light emitted by a source. Unlike lux, lumens do not consider area, but represent the total light output perceived by human vision, providing a quantitative value for brightness emitted in all directions from a light source.
Conversion FAQs
Does converting lux to lumens require knowing the surface area?
Yes, lux measures light intensity per unit area, so without the area illuminated, you cannot convert lux to lumens accurately. Lumens depend on total light output, which is lux multiplied by the surface area receiving the light.
Why is 1200 lux equal to 1200 lumens only at 1 square meter?
Because lux expresses lumens per square meter, when the area is exactly 1 m², lux and lumens values are numerically equal. If the area differs, the total lumens will be lux times the actual area.
Can I convert lumens to lux without area information?
No, converting lumens to lux needs the surface area too. Lumens is total light output, lux is light intensity per square meter, so the area where light spreads must be known to convert correctly.
What happens if the surface area changes in a lux to lumens conversion?
Changing the area changes the total lumens calculated. Larger area with same lux means more total lumens, smaller area means fewer lumens. Area directly scales the conversion.
Are lux and lumens interchangeable units?
No, lux and lumens measure different things. Lux measures intensity on a surface, lumens measure total light output. Their relationship depends on surface area, so they cannot be used interchangeably without that context.