- Project plans
- Project activities
- Legislation and standards
- Industry context
Last edited 09 Aug 2017
Visible light (or the visible spectrum) is a form of electromagnetic radiation. The electromagnetic spectrum includes radio waves, microwaves, infrared radiation (IR), visible light, ultraviolet light (UV), X-rays and gamma-rays. Visible light falls within the range of wavelengths from approximately 380 - 740 nanometers (nm), between the infrared and ultraviolet wavebands.
Visible light represents the range of light that is visible to the human eye. Human eyes contain ‘receiver’ cells called 'cones' that can detect wavelengths within this relatively small part of the electromagnetic spectrum.
Visible light comprises a number of colours that are typically categorised as:
- Red (around 650 nm).
- Orange (around 589 nm).
- Yellow (around 570 nm).
- Green (around 510 nm).
- Blue (around 475 nm).
- Indigo (445 nm).
- Violet (around 400 nm).
Combinations of these colours can create other colours. For example, the combination of red light and blue light will create magenta light. The combination of all colours will create white light. The absence of any light from the visible spectrum is perceived as being black.
Typically, when we see a colour, it is as a result of that wavelength of light reflecting from or transmitting through a body towards our eyes, whilst other wavelengths of the visible spectrum are absorbed by the body or reflected away from our eyes.
 Related articles on Designing Buildings Wiki
Featured articles and news
If events occur that cause the completion of the works to be delayed then these may be compensation events.
BSRIA's new Building MOTs Scheme is designed to provide guidance on the next steps after compliance.
At an ICE discussion, the focus was on delivering a Northern Infrastructure Strategy based on opportunity for all.
The Considerate Constructors Scheme officially launch the new Ultra Site status for contractors and supply chains.
The risk of specification errors in the cladding sector is "worryingly high" after Grenfell, according to major distributor.
Here is our outline work plan for a private sector design and build project.
BRE are to publish new guidance aimed at assuring buyers as to the merits of off-site construction methods.
Who are the various different stakeholders in development projects? Find out in our introductory article.
How a BRE office became the centre-piece for major biophilic design research.
A new interactive virtual experience allows visitors to explore ICE 200 exhibition from anywhere.