What does lux mean?

Lux is a unit of illuminance used to measure the intensity of lighting on a specific surface. The word "lux" comes from the Latin word for light. This unit helps determine how well a space is lightened, which is crucial for a wide range of applications, from offices and homes to industrial and public spaces. One lux is equivalent to one lumen per square metre (lm/m²), meaning it describes the amount of light falling on a surface.

The difference between lux and lumen

Although lux and lumen are both related to the measurement of light, they are different in what they measure:

• Lumen (lm): Measures the total amount of visible light emitted by a light source, regardless of direction. It tells us how much light a light or other light source produces in total.
• Lux (lx): Measures the amount of light that actually reaches a specific surface. One lx is equal to one lumen distributed over an area of one square metre.

Example in practice

If a light source produces 1000 lumen and it is focused on an area of 10 square metres, the illuminance is 100 lux. However, if the same amount of light (1000 lumen) is focused on just one square metre, the illuminance would be 1000 lux. This example shows how the size of the area affects the lux value, while the lumen value remains constant.

When is lux important?

It is a crucial measure in the world of lighting because it helps determine how much light actually reaches a given surface. This is essential for assessing the quality of lighting in different contexts, such as:

• Workstations and offices: Good lighting improves productivity and reduces employee fatigue.
• Public areas: An adequate lux value ensures safety and comfort in areas such as car parks, streets and sports fields.
• Healthcare: In hospitals and clinics, good lighting is crucial for accurate diagnosis and patient care.

How much light is 1 lux?

1 lux is the illuminance produced by a light source with a luminous flux of one lumen, evenly distributed over an area of one square metre. This level of light is roughly equivalent to the light produced by a full moon on a clear night.

How many lux is daylight?

The lux value of daylight varies greatly depending on conditions. On a clear, sunny day, direct sunlight can reach values of 100,000 to 130,000. Under cloudy conditions, this value drops to around 1,000 lx. Daylight is thus considerably brighter than typical indoor lighting, which often ranges from 300 to 500 lx for offices.

What is the light level in lux?

The light level, refers to the amount of light falling on a specific surface. This can range from very low values, such as 0.1 lx in a full moon, to extremely high values such as 100,000 lx in direct sunlight. Different applications and environments require different lux levels to ensure proper visibility and safety.

What does lux mean in sensor lighting?

In sensor lighting, such as motion sensors or daylight sensors, lux is used to evaluate the environment and adjust lighting based on light levels. For example, when it gets darker (lower lux values), a sensor can cause lighting to be switched on automatically to provide sufficient visibility.

How is lux measured?

Lux is measured with a device called a lux meter. This device measures the amount of light falling on a surface. Lux meters are important when designing lighting plans for buildings, stadiums, public spaces and more, as they help ensure adequate lighting according to the standards and needs of users.

Understanding lux, and how it differs from other light metrics such as lumen, is crucial for creating effective lighting environments. By using the right lux values, you can create a comfortable, safe and productive environment for different applications. Whether for workplaces, public spaces or home use, measuring and applying the right lux values is essential.

Guidelines and tips for vehicle lighting

When choosing LED vehicle lighting, there are several important factors to consider:

• General guidelines: The lux values mentioned (100-200 lx for general work areas, 300-500 lx for specific work areas, 500-800 lx for driving on unlit roads, and 800-1000 lx for heavy work environments) correspond to common recommendations for work lights in various work environments. They are intended to provide a balance between sufficient visibility and energy efficiency.
• Depending on the situation: The correct lux value can vary depending on specific situations and working environments. Factors such as weather conditions, the nature of the work, and specific safety requirements play a major role in determining the right lighting.
• Light colour and temperature: Consider the desired light colour and temperature, as different conditions require different types of lighting. For example, choose warmer colours for better visibility in foggy weather conditions.
• Durability: opt for products that last a long time and can withstand the vibrations and shocks that often occur with vehicles. Tip: For work lights on vehicles working in harsh conditions. Go for lights with at least IP68 rating. IP68 offers protection against dust and prolonged immersion in water under specified conditions.
• Regulations: Ensure that LED lighting complies with the regulations and standards in force for vehicle lighting such as ECE R10.

By taking these factors into account, you can choose the most suitable LED lighting that meets the safety, efficiency and reliability requirements for your vehicle.

For advice on the right light for your situation, you can always contact our technical team.