> For the complete documentation index, see [llms.txt](https://docs.betterbuilding.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.betterbuilding.io/user-guide/workflows/daylight/daylight-info/daylight-faqs/daylight-design-introduction.md).

# Daylight Design - Introduction

Daylight design offers an opportunity to control the use of natural light in and around buildings.  Defined as a daylight design strategy, we can design glazing and its ability to provide light into a building. This is often for a combined justification of occupant comfort, energy efficiency and aesthetics. As glazing is a naturally reflective material, we also design light for external needs, often to decrease light reflections for public safety.

We use optics to technically describe the study of daylight, which in the discussion of building envelopes, is ‘visible light’ to the human eye. The visible light spectrum is a relatively narrow part of the electromagnetic spectrum, covering wavelengths between 380 – 780 nm.

![](https://speckelhelp.zendesk.com/hc/article_attachments/360081218414/daylight_design.png)

When light strikes the external surface of the glazing, light components are reflected, absorbed, and transmitted depending on the properties of the glazing, its surface, the respective wavelength, and the angle of incidence. We perceive light visually, while it can also be perceived in the form of heat, as it comprises approximately half of the heat we receive from the sun.

![](https://speckelhelp.zendesk.com/hc/article_attachments/360081218534/daylight_design2.png)


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://docs.betterbuilding.io/user-guide/workflows/daylight/daylight-info/daylight-faqs/daylight-design-introduction.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.