Daylight factor

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/daylight-factor

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 formula?DF = (Ei / Eo) x 100%
2. What is the components?Sky Component (SC), Externally Reflected Component (ERC), Internally Reflected Component (IRC)
3. What is the daylight factor and why is it important?The daylight factor is the percentage of indoor light compared to the light outside on a cloudy sky. It tells architects how bright a room will be and helps reduce the need for electric lights.
4. How do architects calculate the daylight factor?They use the formula DF = (Ei ÷ Eo) × 100%, where Ei is the indoor light level and Eo is the outdoor light level measured on an overcast sky.

Illuminance: A quantitative measure of the amount of light incident on a surface, measured in lux.
CIE Standard Overcast Sky: A standardized model representing diffuse daylight conditions on a uniformly overcast day.
Fenestration: The arrangement, proportioning, and design of windows and doors in a building.
Daylighting Strategies: Architectural techniques used to maximize the use of natural light within a building.