30 Lux to Lumens – Answer with Formula

30 lux corresponds to 30 lumens per square meter, so converting 30 lux to lumens depends on the illuminated area. For example, if the area is 1 square meter, 30 lux equals 30 lumens.

Lux measures illuminance, which is lumens spread over an area. To convert lux to lumens, you multiply the lux value by the area in square meters. Without knowing the area, lux alone can’t be directly converted to lumens.

Conversion Tool


Result in lumens:

Conversion Formula

The formula to convert lux to lumens is:

Lumens = Lux × Area (in square meters)

This works because lux defines how many lumens fall on a square meter. So, multiplying the illuminance (lux) by the surface area gives total luminous flux (lumens) hitting that area.

Example:

  • Given: 30 lux and area = 2 m²
  • Calculation: Lumens = 30 × 2 = 60 lumens
  • This means 60 lumens of light are illuminating the 2 square meters surface.

Conversion Example

  • Convert 15 lux for 3 m² area:
    • Multiply 15 lux by 3 m²
    • Result: 15 × 3 = 45 lumens
  • Convert 50 lux for 0.5 m² area:
    • Multiply 50 lux by 0.5 m²
    • Result: 50 × 0.5 = 25 lumens
  • Convert 40 lux for 1.5 m² area:
    • Multiply 40 lux by 1.5 m²
    • Result: 40 × 1.5 = 60 lumens
  • Convert 10 lux for 4 m² area:
    • Multiply 10 lux by 4 m²
    • Result: 10 × 4 = 40 lumens
  • Convert 25 lux for 2.2 m² area:
    • Multiply 25 lux by 2.2 m²
    • Result: 25 × 2.2 = 55 lumens

Conversion Chart

Lux (lx)Area (m²)Lumens (lm)
5.015.0
10.0110.0
15.0115.0
20.0120.0
25.0125.0
30.0130.0
35.0135.0
40.0140.0
45.0145.0
50.0150.0
55.0155.0

This chart shows lumens calculated assuming a 1 square meter area. To find lumens for different areas, multiply the lux value by the actual area in square meters.

Related Conversion Questions

  • How many lumens are in 30 lux over 2 square meters?
  • What area is needed for 30 lux to equal 90 lumens?
  • Can 30 lux be directly converted to lumens without knowing area?
  • How to calculate lumens from 30 lux in a room of 10 m²?
  • Is 30 lux enough light when converted to lumens for reading?
  • What is the lumen equivalent of 30 lux on a 0.8 m² surface?
  • Does increasing area change lumens for a fixed 30 lux?

Conversion Definitions

Lux: Lux measures illuminance, the amount of visible light that falls on a surface per unit area. One lux equals one lumen per square meter, showing how bright an area is. It helps in lighting design, ensuring spaces get enough light for tasks or safety.

Lumens: Lumens quantify luminous flux, or the total amount of visible light emitted by a source. Unlike lux, that depends on area, lumens measure the light output itself. Higher lumens mean brighter light, important for choosing bulbs or lighting fixtures.

Conversion FAQs

Can I convert lux to lumens without knowing the surface area?

No, lux measures light per unit area, so you need to know the exact surface area to calculate lumens. Without area, lux alone doesn’t give total light output, because lumens depend on both brightness and size of illuminated surface.

Why does lumens increase with larger area if lux stays constant?

If lux is constant, increasing the area means more total light (lumens) spread over that space. So, total lumens equals lux times area. More area with same lux means more lumens because the light covers a bigger surface.

How accurate is assuming 1 square meter area in practical conversions?

Assuming 1 m² simplifies math but may not fit real situations. Real surfaces vary, so exact lumens need actual area measurement. Using 1 m² is good for examples, but actual lighting calculations must adjust for true size.

Does the angle of light affect lux to lumens conversion?

Lux measures light on a flat surface regardless of angle, but if light source angle changes intensity or coverage, lux changes. Lumens stay same as total emitted light, but distribution affects how lux is measured on surfaces at angles.

Is lux always lower than lumens for the same number?

Lux and lumens measure different things, so comparing numbers directly can be misleading. For 1 m² area, lux and lumens numbers match. But if area changes, lumens increase while lux stays per unit area, so one is not always lower or higher.

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About Author

Chara Yadav holds MBA in Finance. Her goal is to simplify finance-related topics. She has worked in finance for about 25 years. She has held multiple finance and banking classes for business schools and communities. Read more at her bio page.