Lux

High school (ages 12+)
Science & Technology

Name:

Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/lux

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. What is the SI derived unit?Illuminance
2. What is the definition?One lumen per square meter (1 lx = 1 lm/m²)
3. How is lux different from candela and lumens?Candela measures how bright a light source is in a direction. Lumens measure the total light a source gives off. Lux measures how that light lands on a surface.
4. Why do we use lux in everyday life?Lux lets designers make rooms comfortable and safe, like offices or hospitals. It also helps cars and phones adjust light for better visibility.

Luminous Flux: The total quantity of visible light emitted by a source per unit time, measured in lumens.
Luminous Intensity: The measure of the light emitted by a source in a specific direction, measured in candela.
Photometric Measurement: The scientific measurement of light, focusing on its perceived brightness by the human eye.