48 lux equals 48 lumens per square meter, but to convert lux to lumens, you need the area over which the light is spread. Without knowing the area, lux and lumens can’t be directly converted because lux measures illuminance and lumens measure luminous flux.
Lux is the luminous flux received per unit area, so lumens equals lux multiplied by area in square meters. If you have 48 lux over 1 square meter, that corresponds to 48 lumens. The conversion depends on the surface size illuminated.
Conversion Tool
Result in lumens:
Conversion Formula
The basic formula to convert lux to lumens is:
Lumens = Lux × Area (in square meters)
Lux measures how much luminous flux spreads over an area. So, to get total lumens from lux, you multiply the illuminance (lux) by the area illuminated. For example, if a surface gets 48 lux over 2 square meters, the total lumens is 48 × 2 = 96 lumens.
Since lux depends on area, without knowing the surface size, you cannot find the exact lumens.
Conversion Example
- Example 1: Convert 30 lux over 3 square meters.
- Start with lux = 30
- Area = 3 m²
- Lumens = 30 × 3 = 90 lumens
- So, total luminous flux is 90 lumens.
- Example 2: Convert 60 lux over 0.5 square meters.
- Lux = 60
- Area = 0.5 m²
- Lumens = 60 × 0.5 = 30 lumens
- Resulting in 30 lumens.
- Example 3: Convert 100 lux over 1.2 square meters.
- Lux = 100
- Area = 1.2 m²
- Lumens = 100 × 1.2 = 120 lumens
- Total luminous flux equals 120 lumens.
- Example 4: Convert 45 lux over 2.5 square meters.
- Lux = 45
- Area = 2.5 m²
- Lumens = 45 × 2.5 = 112.5 lumens
- The output is 112.5 lumens.
Conversion Chart
The following table shows lux values from 23.0 to 73.0 converted to lumens, assuming an illuminated area of 1 square meter. You can use the chart by matching your lux value to find the equivalent lumens for that area.
| Lux (lx) | Lumens (lm) for 1 m² |
|---|---|
| 23.0 | 23.0 |
| 28.0 | 28.0 |
| 33.0 | 33.0 |
| 38.0 | 38.0 |
| 43.0 | 43.0 |
| 48.0 | 48.0 |
| 53.0 | 53.0 |
| 58.0 | 58.0 |
| 63.0 | 63.0 |
| 68.0 | 68.0 |
| 73.0 | 73.0 |
Related Conversion Questions
- How many lumens are in 48 lux over a 2 square meter area?
- What is the formula to convert 48 lux to lumens with unknown area?
- Can 48 lux be converted directly to lumens without area information?
- If a room has 48 lux, how to find total lumens for 5 square meters?
- What lumens correspond to 48 lux on a 0.8 m² surface?
- Why does converting 48 lux to lumens require surface size?
- Is 48 lux equal to 48 lumens always or depends on area?
Conversion Definitions
Lux: Lux is the unit measuring illuminance, representing how much luminous flux hits a surface per square meter. It tells you how bright a surface appears under a light source. One lux equals one lumen per square meter, giving a perception of light intensity on that area.
Lumens: Lumens quantify the total amount of visible light emitted by a source in all directions. It measures the brightness perceived by the human eye. Higher lumens mean a brighter light, regardless of how that light spreads on a surface.
Conversion FAQs
Can I convert lux to lumens without knowing the area?
No, you cannot accurately convert lux to lumens without the area. Lux measures light per unit area, while lumens represent total light output. Without knowing the size of the surface illuminated, you won’t get the total lumens from just lux.
What happens if the area is very small or very large?
If the area is small, the lumens for a given lux value will be less, since total light spreads over less surface. For a large area, lumens increase proportional to area size. So the same lux on a bigger surface means more total lumens.
Does ambient lighting affect lux to lumens conversion?
Ambient light does not change the lux-to-lumen conversion formula itself, but it affects measured lux values. When measuring lux, ambient light adds to illuminance, so total lumens calculated depends on total lux including ambient sources.
Why is lumens preferred over lux for light bulbs?
Lumens indicate the total light output of a bulb, which helps compare brightness between bulbs. Lux varies depending on how far the bulb is and what area it lights up, so lumens give a better measure of the bulb’s real brightness.
Can lux values be higher than lumens?
Lux and lumens measure different things, so one can’t be directly higher than the other without context. Lux is lumens divided by area, so a high lux means intense light on a small area, but total lumens could still be low if area is small.