Daylight Factor, as the name suggests, is a metric used to quantify the amount of natural daylight that penetrates into an indoor area. It's a fundamental tool for architects, interior designers, and anyone involved in creating spaces where illumination is essential. This metric helps determine the level of natural light inside a room, which, in turn, influences factors like energy efficiency and occupant well-being.
The Formula of Daylight Factor Calculator
Daylight Factor (DF) is calculated using a relatively simple formula:
DF = (Indoor Illuminance / Outdoor Illuminance) × 100%
In this formula, "Indoor Illuminance" represents the amount of natural light inside a room, typically measured in lux (a unit of illuminance), and "Outdoor Illuminance" represents the natural light available outside the building, also measured in lux.
General Terms and Calculations
| Term | Definition |
|---|---|
| Lux | A unit of illuminance, measuring light intensity. |
| Daylight Factor (%) | The ratio of indoor to outdoor illuminance. |
| Indoor Illuminance | The amount of natural light inside a room (lux). |
| Outdoor Illuminance | The natural light available outside (lux). |
By referring to this table, you can quickly grasp the terms associated with daylight factor and perform conversions without the need for complex calculations.
Example of Daylight Factor Calculator
Let's put the formula to use with a simple example. Imagine you have a room with an indoor illuminance of 500 lux and an outdoor illuminance of 2,000 lux.
DF = (500 lux / 2,000 lux) × 100% = 25%
In this scenario, the daylight factor for the room is 25%. This means that 25% of the outdoor illuminance penetrates the room, providing a certain level of natural lighting.
Most Common FAQs
Daylight factor is vital in architecture because it affects the quality of indoor lighting. Designers use it to optimize natural light levels, which can reduce the need for artificial lighting, improve energy efficiency, and create spaces that are visually pleasing and conducive to human well-being.
Indoor illuminance can be measured using a light meter, which typically displays values in lux. By taking readings at various points within a room, you can calculate the average indoor illuminance.
While a high daylight factor is generally desirable, excessive natural light can lead to glare and overheating. Designers aim to strike a balance to ensure comfortable and well-lit spaces.