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Artificial light and its effects on colour 5
1.
Level 2 Diploma
in Painting and Decorating © 2013 City and Guilds of London Institute. All rights reserved. Level 2 Diploma in Painting and Decorating Artificial light and its effects on colour Unit 230: Creating and applying colour
2.
Level 2 Diploma
in Painting and Decorating © 2013 City and Guilds of London Institute. All rights reserved. Level 2 Diploma in Painting and Decorating Introduction • As you will now know, the source of colour is natural light – sunlight. • Without light there is no colour but what about inside, under light from a lamp or bulb? • Colour is still visible in these conditions because of the effect of artificial light on a surface. • The following presentation will explain the different types of artificial light and their effect on colour.
3.
Level 2 Diploma
in Painting and Decorating © 2013 City and Guilds of London Institute. All rights reserved. Level 2 Diploma in Painting and Decorating Sources of artificial light Have you ever heard people say that colours on a colour card are not the same as the actual colour of paint? This is because they have probably viewed the colour card under one of the many types of artificial lighting, which has a different spectrum. The three most common types of artificial light are: • Sodium • Tungsten • Fluorescent
4.
Level 2 Diploma
in Painting and Decorating © 2013 City and Guilds of London Institute. All rights reserved. Level 2 Diploma in Painting and Decorating Sodium lights • Sodium lights are most commonly used in street lighting or in motorway tunnels. They give off a amber/yellow hue. • This will wash a surface with an orange/yellow glow, causing it to appear warmer than it actually is. • It could also cause greens to appear slightly brownish and blues to appear slight violet, and other colours to appear different – such as blues may take on a slightly violet appearance.
5.
Level 2 Diploma
in Painting and Decorating © 2013 City and Guilds of London Institute. All rights reserved. Level 2 Diploma in Painting and Decorating Tungsten lights • The most common source of tungsten, also known as incandescent light, is the traditional style light bulb, now slowly being replaced by the more energy efficient CFLs (compact fluorescent lamps). Both of these can effect the appearance of some colours causing them to appear warmer. • They may also reduce the effect of cool or retiring/receding colours.
6.
Level 2 Diploma
in Painting and Decorating © 2013 City and Guilds of London Institute. All rights reserved. Level 2 Diploma in Painting and Decorating Fluorescent lights • The most common type of fluorescent lighting you will come across are strip lights, commonly found in kitchens, offices, hallways and factories. • Fluorescent lights containing low-pressure mercury vapours emit a cooler light with a slight tint of blue voilet. This is because the wavelengths are at the high end of the colour spectrum. • They do not cause colours to appear warm but they can still have an effect on the overall appearance of a colour.
7.
Level 2 Diploma
in Painting and Decorating © 2013 City and Guilds of London Institute. All rights reserved. Level 2 Diploma in Painting and Decorating The metameric effect • The metameric effect occurs because of the way natural light reacts with the different properties of a coloured surface. • The inks and dyes in some colours may absorb or reflect light differently to each other. So a colour swatch for a carpet or set of curtains may give the impression that the colours are an exact match for a paint colour in a shop but may appear slightly different when viewed in a room washed with natural daylight. • This is why it is considered good practice to always select colours in the environment in which they will be used.
8.
Level 2 Diploma
in Painting and Decorating © 2013 City and Guilds of London Institute. All rights reserved. Level 2 Diploma in Painting and Decorating Conclusion • As you can see, these presentations display how science and physics play a strong part in colour and decoration as a whole. • The factors in these presentations can have a very strong bearing on the success or failure of a colour scheme. • By taking these factors into consideration you will be able to develop colours schemes with confidence.
9.
Level 2 Diploma
in Painting and Decorating © 2013 City and Guilds of London Institute. All rights reserved. Level 2 Diploma in Painting and Decorating Any questions?
10.
Level 2 Diploma
in Painting and Decorating © 2013 City and Guilds of London Institute. All rights reserved. Level 2 Diploma in Painting and Decorating Any questions?
Editor's Notes
Linked to worksheet 2 assessment criteria 5.1-5.6
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