Light is an essential aspect of our daily lives. It illuminates our surroundings, allows us to see the world around us, and plays a significant role in our overall health and wellbeing. Beyond regular white light, there are many different colours of light, each with its unique properties and characteristics.

In this article, we will explore the wonderful world of coloured light, its properties, and how it affects us. We will also delve into the science behind coloured light and its role in our environment.

What is Coloured Light?

Coloured light refers to light that contains only a specific range of wavelengths, resulting in a specific colour. The visible spectrum of light ranges from violet (shortest wavelength) to red (longest wavelength).

When all the wavelengths of visible light are together, we perceive it as white light. However, when certain wavelengths are absorbed or reflected, the resulting light appears coloured to our eyes.

Properties of Coloured Light

Each colour of light has its unique properties that affect how it interacts with objects and how we perceive it. Here are some of these properties:


The wavelength of coloured light determines its colour. Light with a shorter wavelength appears blue or violet, while light with a longer wavelength appears red or orange.


The intensity of the light is the amount of energy it carries. The intensity of coloured light affects how bright it appears to our eyes.

Reflection and Absorption

Different colours of light have different reflection and absorption properties. For example, white objects reflect all colours of light, while black objects absorb all colours of light.

Applications of Coloured Light

Coloured light has numerous applications in various fields, including:


Coloured light therapy is a form of alternative medicine that uses coloured lights to treat various health conditions. Each colour is believed to have unique therapeutic properties that stimulate healing and promote relaxation.


Coloured light is a crucial element in the world of entertainment, from stage lighting to disco lights.


Different colours of light can affect plant growth and health. Blue light, for example, is essential for vegetative growth, while red light enhances flowering and fruiting.

The Science of Coloured Light

Coloured light is the result of the interaction between light and matter. When light hits an object, some wavelengths are absorbed, while others are reflected. The reflected wavelengths determine the colour of the object.

The field of optics studies the behaviour of light, including its properties and how it interacts with matter.