1200 lux corresponds to 1200 lumens when the illuminated area is exactly 1 square meter. This means that if a surface of 1 m² is lit with 1200 lux, the total luminous flux falling on it is 1200 lumens.
Lux and lumens are related but measure different things. Lux measures illuminance or light intensity per unit area, while lumens measure total luminous flux. To convert lux to lumens, you need the area over which the light is spread. Without area, lux alone cannot be converted to lumens precisely.
Conversion Tool
Result in lumens:
Conversion Formula
The formula to convert lux (lx) to lumens (lm) depends on the area illuminated. Lumens equal lux multiplied by the illuminated area in square meters:
Lumens (lm) = Lux (lx) × Area (m²)
This formula works because lux measures luminous flux per unit area. For example, if 1200 lux is shining on an area of 1 m², the total luminous flux is:
- Lux = 1200 lx
- Area = 1 m²
- Lumens = 1200 lx × 1 m² = 1200 lm
If the area changes, the lumens change accordingly. For example, 1200 lux on 2 m² yields 2400 lumens.
Conversion Example
- Example 1: Convert 1500 lux to lumens for 1 m²
- Lux value: 1500 lx
- Area: 1 m²
- Calculation: 1500 × 1 = 1500 lumens
- Example 2: Convert 800 lux to lumens for 1.5 m²
- Lux value: 800 lx
- Area: 1.5 m²
- Calculation: 800 × 1.5 = 1200 lumens
- Example 3: Convert 1000 lux to lumens for 0.75 m²
- Lux value: 1000 lx
- Area: 0.75 m²
- Calculation: 1000 × 0.75 = 750 lumens
- Example 4: Convert 2000 lux to lumens for 2 m²
- Lux value: 2000 lx
- Area: 2 m²
- Calculation: 2000 × 2 = 4000 lumens
Conversion Chart
The table below shows lux values from 1175.0 to 1225.0 and their corresponding lumens assuming an illuminated area of 1 square meter. To use the chart, multiply the lux value by the area to get lumens.
| Lux (lx) | Lumens (lm) |
|---|---|
| 1175.0 | 1175.0 |
| 1180.0 | 1180.0 |
| 1185.0 | 1185.0 |
| 1190.0 | 1190.0 |
| 1195.0 | 1195.0 |
| 1200.0 | 1200.0 |
| 1205.0 | 1205.0 |
| 1210.0 | 1210.0 |
| 1215.0 | 1215.0 |
| 1220.0 | 1220.0 |
| 1225.0 | 1225.0 |
Related Conversion Questions
- How many lumens are equivalent to 1200 lux over 2 square meters?
- What is the lumen output if 1200 lux shines on a 0.5 m² surface?
- Can I convert 1200 lux to lumens without knowing the area?
- Why does 1200 lux correspond to different lumens for different surfaces?
- How to calculate lumens from 1200 lux for a 3 m² area?
- Is 1200 lux a bright light in terms of lumens?
- What is the difference between lux and lumens when dealing with 1200 lux?
Conversion Definitions
Lux: Lux is a unit measuring illuminance, representing how much luminous flux is spread across a given surface area. One lux equals one lumen per square meter. It indicates how brightly a surface is lit, accounting for both light intensity and the size of the area lighting.
Lumens: Lumens measure total luminous flux, quantifying the total amount of visible light emitted by a source. Unlike lux, lumens do not consider area but give a measure of total light output from a bulb or other source, regardless where the light falls.
Conversion FAQs
Can lumens be calculated from lux without knowing the area?
No, lumens cannot be accurately calculated from lux alone unless the surface area illuminated is known. Lux measures light intensity per unit area, so without area, total luminous flux (lumens) is unknown.
What happens to lumens if the area increases but lux stays constant?
If the lux remains constant and the area increases, the total lumens also increases proportionally. This is because lumens equal lux times area, so larger illuminated areas mean more total light.
Is 1200 lux considered a bright environment?
1200 lux is moderately bright, similar to typical office lighting or a well-lit room. It provides enough illumination for detailed tasks but is less intense than direct sunlight, which can exceed 100,000 lux.
Does the conversion change if the surface is not flat?
The conversion formula assumes a flat surface perpendicular to the light source. If the surface is uneven or angled, the effective illuminated area differs, altering the lux to lumens relationship.
Why is knowing lumens important when comparing light sources?
Lumens measure total light output, which helps compare brightness between bulbs regardless of beam angle or distance. Lux varies by how light spreads, but lumens show the absolute light given off by the source.