Advantage of a North-light Roof in Industrial Buildings

The advantage of a north-light roof in industrial buildings in the northern hemisphere is that it permits diffused daylight into the building and helps avoid glare from direct sunlight. This is the correct answer, as option 'C' suggests.

Explanation:

1. North-light Roof Design:
- A north-light roof is a specific type of roof design that incorporates large windows or skylights on the north-facing side of the building.
- These windows or skylights are typically placed at a high angle to maximize the amount of natural light entering the building.

2. Diffused Daylight:
- The north-light roof design allows diffused daylight to enter the building.
- Diffused daylight is the soft, indirect light that is evenly distributed throughout a space.
- Unlike direct sunlight, which can cause glare and harsh shadows, diffused daylight provides a more comfortable and natural lighting environment.

3. Avoiding Glare:
- Glare occurs when there is excessive brightness or contrast in the visual field.
- Direct sunlight can cause glare, which can be uncomfortable and even hazardous in some industrial settings.
- By having a north-light roof that permits diffused daylight, the building can avoid the glare associated with direct sunlight.

4. Benefits of Diffused Daylight:
- Diffused daylight offers several advantages in industrial buildings:
- It improves visibility, making it easier for workers to perform tasks.
- It reduces the need for artificial lighting during the day, leading to energy savings.
- It enhances the overall aesthetics of the space, creating a more pleasant working environment.

5. Other Options:
- The other options provided in the question are not correct.
- Option 'A' suggests that a north-light roof allows sunlight into the building, which is true, but it fails to mention the specific advantage of diffused daylight and glare reduction.
- Option 'B' is unrelated to the topic, as it discusses the Aurora Borealis, which is a natural light display phenomenon.
- Option 'D' suggests that a north-light roof allows both sunlight and the prevailing northern breeze into the building, which is not necessarily true as the focus of a north-light roof is primarily on diffused daylight.

In conclusion, the advantage of a north-light roof in industrial buildings in the northern hemisphere is that it permits diffused daylight into the building and helps avoid the glare of direct sunlight. This design choice improves visibility, reduces the need for artificial lighting, and creates a more comfortable and aesthetically pleasing working environment.