Elara Bennett100 lux is equal to 100 lumens per square meter times the area in square meters. Without knowing the area, lux cannot be directly converted to lumens. However, if we assume an area of 1 square meter, then 100 lux corresponds to 100 lumens.
Lux measures illuminance or how much light falls on a surface area, while lumens measures the total amount of visible light emitted by a source. To convert lux to lumens, you multiply the lux value by the area in square meters the light is spread across.
Conversion Tool
Result in lumens:
Conversion Formula
The formula to convert lux (lx) to lumens (lm) is:
Lumens = Lux × Area (in square meters)
Lux measures how brightly light shines on a surface area, so to find the total light output in lumens, you multiply the lux value by the surface area the light covers. For example, if 100 lux lights up 2 square meters, the total lumens would be 100 × 2 = 200 lumens.
Step-by-step example:
- Given lux: 100 lx
- Given area: 1.5 m²
- Calculate lumens: 100 lx × 1.5 m² = 150 lm
Conversion Example
- Example 1: 50 lux over 2 m²
- 50 lx means 50 lumens per square meter
- Multiply by area: 50 × 2 = 100 lumens
- Result: 100 lm total light output
- Example 2: 120 lux over 0.75 m²
- 120 lx times 0.75 equals 90 lumens
- This means total light output is 90 lm
- Example 3: 200 lux over 1.2 m²
- Calculate 200 × 1.2 = 240 lumens
- 240 lm is the total light amount
- Example 4: 80 lux over 1 m²
- 80 × 1 = 80 lumens
- Simple case where area is one square meter
Conversion Chart
| Lux (lx) | Lumens (lm) for 1 m² area |
|---|---|
| 75.0 | 75.0 |
| 80.0 | 80.0 |
| 85.0 | 85.0 |
| 90.0 | 90.0 |
| 95.0 | 95.0 |
| 100.0 | 100.0 |
| 105.0 | 105.0 |
| 110.0 | 110.0 |
| 115.0 | 115.0 |
| 120.0 | 120.0 |
| 125.0 | 125.0 |
The chart shows how many lumens correspond to different lux levels assuming the light covers exactly 1 square meter. To use for other areas, multiply the lumens by the surface area in square meters.
Related Conversion Questions
- How many lumens are in 100 lux over 3 square meters?
- Can I convert 100 lux to lumens without knowing the area?
- What is the lumens output for 100 lux lighting a 0.5 m² surface?
- How do I calculate lumens from 100 lux for irregular surfaces?
- Is 100 lux equal to 100 lumens always?
- Does the area size affect conversion from 100 lux to lumens?
- What formula do I use to convert 100 lux into lumens?
Conversion Definitions
Lux: Lux is the unit measuring illuminance, which express how much luminous flux strikes a surface per unit area. One lux equals one lumen per square meter, indicating the brightness experienced on that surface, the higher the lux, the brighter the surface appears.
Lumens: Lumens measure the total quantity of visible light emitted by a source in all directions. It quantifies the perceived power of light, used to compare brightness of light bulbs or lighting devices without considering the area illuminated.
Conversion FAQs
Why does the area matter when converting lux to lumens?
Lux measures light intensity on a surface, so without knowing the area over which light is spread, you can’t find the total light output in lumens. Lumens represent total light emitted, lux is that light spread over an area. Area size changes the total lumens when converting.
Can I convert 100 lux to lumens if the surface size is unknown?
No, you can’t have an exact conversion without the surface area. Lux is lumens per square meter, so knowing only lux value doesn’t give total lumens. You must know or assume the illuminated area to calculate lumens from lux.
Does changing the surface shape affect lux to lumens conversion?
The shape itself doesn’t directly affect the conversion; it’s the total area illuminated that matters. Whether the surface is round, square or irregular, the total area in square meters is multiplied by lux to get lumens.
How accurate is assuming 1 square meter area for conversions?
Assuming 1 m² gives a direct numerical equality between lux and lumens, but it only accurate if the actual illuminated area is 1 m². For other areas, the result will be off proportionally.
Can a light source have high lumens but low lux?
Yes, if the light spreads over a very large area, the lux (illumination per unit area) can be low even though the source emits high lumens overall. Lux depends on both lumens and how concentrated the light is on a surface.
