LED Specs – ILP 2010 With LED’s emerging as a new functional light source there is a need to ensure performance claims are made in a consistent way. This is the second edition of the guidance notes, taking into account new IEC standards and the development of LED technology. These guidance notes are harmonised with [...]

Download Brochure This briefing note has been prepared by the ILE Technical Committee for study and application. The document reports on current knowledge and experience within the specified field of light and lighting described and is intended to be used by the ILE membership and other interested parties. This is a briefing note and is [...]

IDA wants to educate people on the importance of quality outdoor lighting and it is always good to start with the basics. Understanding how the eye works is the first step to good lighting.

There are three basic types of cone receptor. They respond to red, green and blue light respectively. It is the relative output of these three receptors, which determine what particular color we see.

A light sensitive organ of vision that can distinguish minute variations of shape, colour, brightness and distance. The actual process of seeing is performed by the brain rather than the eye. The function of the eye is to translate the light into patterns of nerve impulses that are transmitted to the brain.

Light is a natural phenomenon, vital to our very existence, which we probably take for granted in every day life. But the quality and intensity of light around us totally affects our visual appreciation and understanding of our surroundings.

This adaptation is important because not only does the eye discriminate between different wavelengths of light with the sensation of colour, but it is also more sensitive to some wavelengths than others and this sensitivity alters between Photopic and Scotopic Vision.

Light emitted from a source or received by a surface is referred to as luminous flux, which is measured in Flux in Lumens (lm).