Reflection is an integral part of the art and the science of lighting. It plays a crucial role in both architecture and luminaire design and manufacture. As a result of research and experimentation, we now understand how to exploit the potential of reflection: by focusing light on specific objects or surfaces we can create luminance and atmosphere. Since ancient times, human beings have endeavoured to use reflection purposefully in architecture and the Persians were among the first to design with reflected light: they developed the unique art of decorating walls and ceilings with mirror mosaics. The way that light is radiated and reflected is one of the first things anyone studying lighting will learn about. To be able to design with light it is essential to understand how light is reflected by different surfaces, and when developing a luminaire reflector technology - the form of the reflector and the material it is made of - is critical to achieving the desired result. Today we have the know-how and the means to enhance the reflectance of materials by colouring, brushing or polishing them. The development of new light sources of different shapes and sizes, and the availability of pure aluminium, has led to sophisticated reflector technology that can increase lamp and luminaire efficiency substantially.
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