Lux Lumens and Watts per square meter

In summary, Lux, Lumens, and Watts per square meter are all units of measurement used to quantify the brightness or intensity of light. Lux measures the amount of light that falls on a surface, Lumens measures the total amount of light emitted by a source, and Watts per square meter measures the power or energy of light over a specific area. These units are commonly used in lighting design and can help determine the appropriate lighting levels for different environments.
  • #1
Deleted member 74205

Homework Statement


I am looking for a conversion factor that will ultimately get me from units of lux (illumination) which is a weighted scale of light intensity, to watts per square meter, which is not weighted.


Homework Equations


None availiable


The Attempt at a Solution


I am informed that the conversion is different for each wavelength of light, so there may be a conversion table with a list of wavelengths?
 
Physics news on Phys.org
  • #2
Have you read what the IESNA has to say about this topic?
 
  • #3


I would suggest using the following conversion formula:

W/m2 = lux * (wavelength in nm) / (683 * 100)

This formula takes into account the different wavelengths of light and converts lux to watts per square meter. However, it is important to note that this conversion may not be entirely accurate as lux is a subjective measure of light intensity and does not take into account the human eye's sensitivity to different wavelengths. Additionally, this formula assumes a standard luminous efficiency of 683 lumens per watt. It would be best to consult a conversion table for more accurate conversions for specific wavelengths of light.
 

FAQ: Lux Lumens and Watts per square meter

What is the difference between lux and lumens?

Lux is a unit of measurement for illuminance, or the amount of light that falls on a surface. Lumens, on the other hand, is a unit of measurement for luminous flux, or the total amount of visible light emitted by a light source. In simpler terms, lux measures the amount of light that is actually reaching a surface, while lumens measures the total amount of light being emitted.

How are lux and lumens related to watts per square meter?

Lux and lumens are both related to watts per square meter, but in different ways. Lux is a measure of illuminance, which is affected by the distance between a light source and a surface. Watts per square meter, on the other hand, is a measure of radiant flux density, or the amount of energy per unit area. Lumens can be converted to watts per square meter by dividing the number of lumens by the area in square meters. The resulting value is the illuminance in watts per square meter.

What is the importance of lux and lumens in lighting design?

Lux and lumens play crucial roles in lighting design, as they help determine the appropriate amount of light needed for a specific space. By understanding the relationship between these two units of measurement, designers can ensure that a space is adequately lit for its intended use, whether it be for reading, working, or simply creating a certain ambiance.

How do lux and lumens affect human perception of light?

Lux and lumens can have a significant impact on how humans perceive light. For example, a higher lux value can make a space feel brighter and more inviting, while a lower lux value can create a more cozy and intimate atmosphere. Similarly, increasing or decreasing the amount of lumens can affect how objects and colors appear in a space, as well as how well people can see and perform tasks.

What factors can influence lux and lumens measurements?

There are several factors that can influence the measurements of lux and lumens in a given space. These include the distance between the light source and the surface, the type and quality of the light source, the reflectivity of the surface, and any obstructions or shadows that may affect the amount of light reaching the surface. It is important to take these factors into consideration when measuring and designing for lux and lumens.

Similar threads

I Lux-meter, candelas or lux, measuring nits in practice
Replies
2
Views
4K
Calculating distance between lux meter and light source
Replies
2
Views
2K
Ratio of Intensities of 2 sounds
Replies
5
Views
2K
B Converting Lux to W/m^2 for Solar Radiation Measurement
Replies
9
Views
8K
Convert solar radiation from Joule per cm square to Watt per meter^2?
Replies
1
Views
7K
How can I convert lux to watts for CFL bulbs?
Replies
2
Views
1K
Photon Arrival Rate, Chapter 1.5 from Computer Graphics by Folly
Replies
15
Views
2K
B What is the Relationship Between Candelas, Watts, and Brightness?
Replies
8
Views
3K
Converting Volt to Lux using a solarimeter
Replies
1
Views
5K
Spectral radiance of the sun for 400nm
Replies
5
Views
2K

Hot Threads

Recent Insights

Back
Top