Lighting technology: a guide for television, film, and by Brian Fitt, Joe Thornley

By Brian Fitt, Joe Thornley

An individual operating with lighting fixtures within the leisure industries will locate this an immensely readable resource of knowledge. The authors, themselves skilled lights practitioners, have amassed a wealth of crucial lights expertise and information into one accomplished reference quantity in an obtainable, jargon-free type. the recent version of this renowned textual content covers the very most modern expertise, together with advances in lamps, motorised lighting fixtures, dimmers and keep an eye on structures and present protection laws. A finished 'on-the-job' instrument, for simple reference provides technical info in a readable, jargon-free kind, for ease of realizing presents thorough insurance of the topic, to maintain you brand new with the newest expertise

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Probably at some time in our lives, we have thrown an object into a fire and then been amazed at the magnificent colours produced when it burns. The colours are unique to the substance. In 1752 a Scotsman, Thomas Melvill, studied the light from a flame through a prism and discovered that the spectrum was not continuous. Some parts of the observed spectrum were bright and other parts were dark. When Melvill experimented with different chemicals burning in the flame, he found the locations of the bright and dark areas changed.

Adaptation and glare The light sensitivity of the eye usually adapts itself to the illumination we are observing. A good example of this is coming from a fairly dark room into very bright sunlight and it doesn't take very long for us to adjust to the new conditions, although the light levels are incredibly different. Adaptation requires a period of time to work and in fact requires a long time to get used to dark after light, more than 30 minutes, but on the other hand it does not take long to be accustomed to light after dark.

Adaptation requires a period of time to work and in fact requires a long time to get used to dark after light, more than 30 minutes, but on the other hand it does not take long to be accustomed to light after dark. There are limits to adaptation and this can be when luminance is so great that glare can occur. We have all had the problem of reading from white paper in a full summer sun, where the luminance value may be as high as 25 000 candela/m2 , and although it may be possible to read under these circumstances it is very uncomfortable.

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