The Visual Guide

The Visual Guide provides an understanding of:

  • Kelvin Colour Temperature
  • Colour Rendering Index
  • Beam and Glarez

Colour Temperature and Colour Rendering

There are 2 very important aspects of light relating to colour which are often referred to but not always understood. 

Both properties of lamps have very different meanings and implications.

Colour temperature is in the unit of absolute temperature, Kelvin, noted by the symbol K.

Colour Rendering is the measurement of how light affects the appearance of the colour. 

How to Choose the Right Kelvin Colour Temperature?

Use the Kelvin Temperature Scale it can guide you in determining which fixture is right for each room

The influence of daylight on the human body

Studies have been undertaken as to how we react, physically and mentally, under certain Colour Temperatures. Such as the Circadian Rhythm The non-visual receptor in our eyes responds to light and regulates our levels of the key hormones: Cortisol, Melatonin and Serotonin. 

Serotonin is produced by the brain when melatonin levels are low. Daylight regulates these hormones, to ensure a good balance throughout the day. For office workers, good lighting design is required to have the same effect.

Which Colour Tone is best for you?

Colour temperatures higher than 3500K are typically used for commercial applications, as the light is bright and has a bluish daylight cast that can be harsh for home interiors.

In lighting designs, the feelings evoked by the memory of the sun’s colour are used to replicate and create an atmosphere or ambience which helps maximize things like:

Lighting is a very personal topic, as we all have our perspective and opinion on what we want from our lighting.

Speak to a BrightSpark about how lighting can improve the productivity of  your business.

How Different Colour Temperatures affect your "Body Clock"

Cool White

  • Reflects early morning and therefore we tend to concentrate more and have more energy.

Warm White

  • Reflects late afternoon when we are starting to wind down for the day and have a calmer feel.

Very Warm White

  • This mirrors sunset when we are relaxed and winding down for the day.

Colour Rendering Index

Lighting temperatures can range from infrared light to the kind coming from a skylight, all the way to ultraviolet light. You want to use lighting that will best illuminate each room.

The Colour Rendering Index is measured on an index chart of 0-100 Ra, where 100Ra = sunlight, i.e., replicating how the product looks under sunlight, and where the value of 0 means that the product 

The majority of indoor lighting schemes would be expected to meet a CRI of 80 or higher for most working activities

Speak to a BrightSpark about how lighting can improve the productivity of  your business.

Why is colour rendering important for your business?

All lamps are not made equal and there is a range of LED lamps that have a CRI rating, from 50-95Ra, can have an impact on the way your decoration looks. 

Under a poor CRI, the room can lose its ‘spark’ and the area can look flat and the colours dim. 

CRI-before2 CRI-after2

How do you make sure the CRI is good enough?

The EU directive for lighting suggests that lighting should have a CRI of equal or greater than 85.