All that we see is the reflection of light on objects. In fact, we perceive only the reflected colors. Yellow is not in a lemon. Instead, the surface of the lemon reflects the wavelength we read as yellow and absorbs the rest. Similarly, objects look white when they reflect every color, and black when they swallow them all.
The Four Layers of Lighting Design
Not all that shines is gold. However, the right composition can make something ordinary appear priceless. Good lighting design works in four functional categories: ambient, accent, task and decorative. Together, these four layers give a room balance, comfort and richness. Above all, match the amount of light to its purpose.
Ambient Light
To start, ambient light is the light we see naturally during the day. It shows us everything we need in order to function. Therefore, it carries a sense of comfort and safety. Outdoors this light comes from the sun, and indoors it reaches us through a window. As a result, ambient daylight is the most efficient and economical layer of all.
Shades, window shelves and the natural path of the sun let us stretch that daylight further. In short, working with what the environment already offers is the most energy efficient move a designer can make. Artificial fixtures can also supply ambient light. For example, LED lamps rank among the most efficient options on the market today.
Accent Light
Accent light picks out a specific area or object. Designers usually achieve it with directional fixtures such as down lights. Notably, this layer adds drama, individuality and visual interest. It can pull the eye toward one object, or graze a wall to reveal texture and architectural detail. Soft, warm accents calm a room. In contrast, cooler and brighter accents energize it.
Task Lighting
Task lighting should read at least three times brighter than its surroundings. People rely on it while reading, cooking or operating equipment. First, it spares the eyes during close work. Second, it keeps knife work safe in a kitchen. Finally, in a bathroom it supports shaving and applying makeup.
Decorative Light
The fourth layer is decorative light. Here the fixture itself matters more than the light it throws. Consequently, a decorative piece can become the statement feature of a room. Still, on its own it rarely lights a space well enough for real work.
Putting the Four Layers to Work
In the end, every good lighting design respects all four layers. Most of us picture artificial fixtures first. Yet optimizing daylight matters just as much, for both practicality and beauty. So when you add light, decide what purpose it serves before you choose the fixture.