1200 lux corresponds to 1200 lumens on a 1 square meter surface area. This means when an area of 1 square meter is illuminated with 1200 lux, the total luminous flux falling on it is 1200 lumens.
Lux measures illuminance, the amount of light hitting a surface per unit area, while lumens measure luminous flux, the total amount of visible light emitted. Converting lux to lumens requires knowing the area illuminated, since lumens = lux × area.
Conversion Tool
Result in lumens:
Conversion Formula
The formula to convert lux to lumens depends on the surface area being illuminated. Lux (lx) is lumens per square meter (lm/m²), so to get lumens (lm), multiply lux by the surface area (m²):
Lumens (lm) = Lux (lx) × Area (m²)
This works because lux measures how much light falls on each square meter, so to find total light, multiply by how many square meters are lit. For 1 square meter:
For example, if you have 1200 lux over 1 m²:
1200 lx × 1 m² = 1200 lm
If the area were 2 m², then:
1200 lx × 2 m² = 2400 lm
Conversion Example
- Convert 500 lux over 1 m²:
- Multiply 500 by 1 (area)
- 500 × 1 = 500 lumens
- Result: 500 lumens total light
- Convert 750 lux over 2 m²:
- Multiply 750 by 2
- 750 × 2 = 1500 lumens
- Result: 1500 lumens
- Convert 1000 lux over 0.5 m²:
- Multiply 1000 by 0.5
- 1000 × 0.5 = 500 lumens
- Result: 500 lumens
- Convert 2000 lux over 1.5 m²:
- Multiply 2000 by 1.5
- 2000 × 1.5 = 3000 lumens
- Result: 3000 lumens
Conversion Chart
| Lux (lx) | Lumens (lm) for 1 m² |
|---|---|
| 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 |
This chart shows lux values from 1175 to 1225 converted into lumens assuming the area is 1 square meter. It can be used quickly to find total light output for these lux levels when illumination area is 1 m².
Related Conversion Questions
- How many lumens are in 1200 lux on a 3 square meter surface?
- Does 1200 lux always equal 1200 lumens?
- What formula converts 1200 lux to lumens when area is 5 m²?
- Can 1200 lux be converted to lumens without knowing the surface size?
- If a lamp produces 1200 lumens, what is the lux on a 1 m² area?
- How to convert 1200 lux to lumens for different room sizes?
- Is 1200 lux high or low in terms of lumens output?
Conversion Definitions
Lux: Lux is a unit measuring illuminance, which is amount of light falling on a surface area. One lux equals one lumen per square meter. It tells how brightly a surface is lit, not the total light emitted by source.
Lumens: Lumens quantify luminous flux, total amount of visible light emitted by a source. Unlike lux, lumens do not consider area but indicate how much light a lamp or bulb produces in all directions.
Conversion FAQs
Can lux be converted to lumens without the surface area?
No, lux alone is insufficient to find lumens because lux measures light per unit area. Without knowing how big the illuminated surface is, total light output (lumens) can’t be calculated accurately.
What happens to lumens if surface area changes but lux stays constant?
If lux remains the same but area increases, lumens increase proportionally. Since lumens = lux × area, doubling the area doubles lumens at the same lux level.
Is lux measurement affected by distance from the light source?
Yes, lux decreases with distance because light spreads over larger area. The luminous flux (lumens) stays same but illuminance (lux) drops as distance increases.
How to measure surface area when converting lux to lumens?
Surface area can be measured in square meters using length × width for flat surfaces. For irregular shapes, approximate area or sum of parts is used for conversion.
Are lumens always greater than lux values?
Not always, because lumens depend on area. If area is less than 1 m², lumens can be less than lux. When area equals 1 m², lumens equal lux numerically.