What does lumen mean in lighting?

Lumen indicates how much visible light a lamp emits. This is important for determining brightness, whereas wattage only indicates energy consumption. When choosing lighting, lumen helps you find the right brightness for, say, ambient lighting or task lighting.

There are clear guidelines for choosing the right lumen value for indoor and outdoor lighting. These help you determine the ideal brightness for each room and application. With energy-efficient LED lighting, you get just the right amount of light without unnecessary energy consumption.

What is lumen?

Lumen (lm) is the unit that measures the total amount of visible light a light source emits in all directions. It indicates how bright a light source is, regardless of the type of light source, such as LED, halogen or incandescent.

A candle, for example, produces around 12 lumens, while a 10W LED bulb can generate around 800 lumens. Lumen is therefore important when comparing different light sources based on brightness, so you can choose the right amount of light for a specific room or application.

How do you determine the right amount of lumens?

You determine the right amount of lumens based on the size of the room and its intended use. For ambient lighting, you need fewer lumens than for functional lighting. For a living room, 300-500 lumens per square metre is suitable, while workspaces need 500-1000 lumens.

Reading lamps require around 400 lumens, while outdoor lighting often ranges between 200-700 lumens. Personal preference for brightness and atmosphere also plays a role in choosing the required amount of lumens.

How does lumen relate to watt and lux?

Lumen measures the brightness of a light source, watt indicates energy consumption, and lux measures the amount of light per square metre. Lumen to watt means comparing the amount of light against the number of watts the lamp consumes.

A 60-watt incandescent bulb produces around 800 lumens. An LED bulb with the same 800 lumens uses only 8-10 watts, which shows how energy-efficient LED bulbs are. Below, we've put together a table showing how the number of watts in lighting differs between halogen and LED bulbs:

Lamp type	Wattage (W)	Lumen (lm)
Halogen	50W	700 lm
LED	10W	700 lm

Why is lumen important when choosing lighting?

Lumen is important when choosing lighting because it determines whether you have the right amount of light for a specific room or function. For ambient lighting, you often need fewer lumens, while workspaces require higher values. For example, a living room usually needs 300-500 lumens per square metre, while a workspace requires 500-1000 lumens for sufficient light.

Examples of lumen values for different applications

When choosing the right lighting, it's important to focus on the lumen value, as this indicates the brightness of the lamp. Here is an overview of common lumen values for different applications:

Ambient lighting: 100-300 lumens for soft, warm lighting.
Functional lighting: 500-1000 lumens, for example for desk lamps.
Outdoor lighting: 500-2000 lumens, depending on the location.

Special applications: