1200 Lm to Lux – Full Calculation Guide

1200 lumens (lm) converted to lux depends on the area over which the light spreads; if it spreads over 1 square meter, the illuminance is 1200 lux (lx).

Lux measures illuminance, which is lumens per square meter. So, to convert lumens to lux, you divide the luminous flux by the illuminated surface area in square meters. Without an area value, you cannot directly convert lm to lux.

Conversion Tool

Conversion Formula

The formula for converting lumens (lm) to lux (lx) is:

lux = lumens / area (in square meters)

This formula works because lux measures the amount of luminous flux (lumens) falling on a surface area. The larger the area, the lower the illuminance value.

Example calculation:

• Given 1200 lm of light
• Assuming area illuminated is 1 m²
• lux = 1200 lm / 1 m² = 1200 lx

Conversion Example

• Convert 1500 lm over 2 m²:
  • Step 1: Identify lumens = 1500 lm
  • Step 2: Determine area = 2 m²
  • Step 3: Apply formula: 1500 / 2 = 750 lx
  • Result: 750 lux
• Convert 800 lm over 0.5 m²:
  • Step 1: Lumens = 800 lm
  • Step 2: Area = 0.5 m²
  • Step 3: 800 / 0.5 = 1600 lx
  • Result: 1600 lux
• Convert 1000 lm over 4 m²:
  • Step 1: Lumens = 1000 lm
  • Step 2: Area = 4 m²
  • Step 3: 1000 / 4 = 250 lx
  • Result: 250 lux
• Convert 2000 lm over 5 m²:
  • Step 1: Lumens = 2000 lm
  • Step 2: Area = 5 m²
  • Step 3: 2000 / 5 = 400 lx
  • Result: 400 lux

Conversion Chart

This chart shows lumens between 1175 and 1225 all converted to lux assuming the light spreads over exactly 1 square meter. To find the illuminance for a different area, divide the lumens value by that area.

Related Conversion Questions

• How many lux will 1200 lm produce on a 2 square meter surface?
• What is the lux value for 1200 lumens lighting a 0.75 m² area?
• Can 1200 lm be converted to lux without knowing the area?
• How does changing the surface area affect the lux from 1200 lm?
• Is 1200 lumens equal to 1200 lux?
• What lux level results from 1200 lm over 3 m²?
• How to calculate lux from 1200 lm for uneven surfaces?

Conversion Definitions

lm (lumen): A lumen is a measure of luminous flux, describing the total quantity of visible light emitted by a source per unit of time. It quantifies brightness perceived by the human eye, without regard to direction or area illuminated, representing the light output from lamps, LEDs, and bulbs.

lux: Lux is a unit of illuminance measuring luminous flux per square meter. It describes how much light falls on a surface, factoring in both the intensity of the source and the area illuminated. Lux indicates the brightness perceived on a specific surface, important for lighting design and standards.

Conversion FAQs

Why can’t I convert lumens to lux without area information?

Because lux depends on the area over which the luminous flux spreads, lumens alone don’t provide enough data. Lumens measure total light output, while lux measures light per unit area. Without knowing surface size, the illuminance can’t be calculated accurately.

Does a higher lumen always mean higher lux?

Not necessarily. If the same lumens spread over a larger area, the lux decreases. Conversely, concentrating lumens on a small area increases lux. So, lux depends on both lumens and the surface size illuminated.

How to measure the area for converting lumens to lux?

Measure the surface where the light falls, in square meters. For flat surfaces, multiply length by width. For irregular shapes, approximate or divide the space into measurable sections, then sum their areas for conversion.

Can lux be higher than lumens?

Lux is lumens per square meter, so lux values can be higher or lower than lumens depending on area. For example, 1000 lm concentrated on 0.1 m² results in 10,000 lx, which is higher than the total lumens number.

Is lux always measured at 1 meter distance?

Lux depends on distance because light intensity decreases with distance squared. Measuring lux at 1 meter is common for standardization, but actual lux varies with distance and angle of the light source.