After three years of work
Milan , January 31, 2016 – 15:09
The high artistic value of the Sistine Chapel is now even more valuable thanks to an innovative software that makes the system lighting more flexible in controlling all the parameters that govern the physical quantities, such as the type of current, the flow of light and balanced spectrum that integrates them. “This new set of programs, already capable of directing point by point the light of each of the LEDs 7000 of the system, has been recently updated in the control algorithms, in order to increase the quality of light and therefore improve the perception of the works “, says Carlo Maria Bogani, executive director of the Sistine Chapel for lighting Osram Italy.
Three years of work
The lighting of the Sistine Chapel, where the project began in 2011, lasted three years and involved a team of about one hundred people, including physicists, optical engineers, architects, construction workers and researchers belonging to the consortium called LED4art which brought together various skills (Osram, University of Pannonia in Hungary, and Irec FABERtechnica), continues to act as an example to follow to enhance and preserve our good works of art. Choose a composition of lights integrated together give a light spectrum in harmony, for example with a painting, actually it means to emphasize the work of art as the artist has thought with all its features and shades of color.
The importance of light
Consider for example a painting by dark shades. If it is poorly lit, the perception that we see is that of a great black background in which glimpsed scenes and figures just mentioned. However, if the incident light is in line with the brushstrokes of the artist, that’s starting to emerge from the background features, profiles, fine details, attracting our attention, make us admire and gaze at the picture. A right set of lights with which to flood the surfaces of paintings, frescoes, statues, monuments is also important to protect the works of art themselves from degradation.
The right wavelength
In order not to deteriorate colors, lacquers pigments and necessary to eliminate the harmful emissions from the light source, that is to say the infrared rays (with a wavelength exceeding 660 nm-nm) that can warm and determine thermal gradients, and ultraviolet rays (smaller than 400 nm) that they may change the physico-chemical properties and therefore lead to discoloration of the manufactured articles. To obtain chromatic yields very high, for example greater than or equal to 98 (the solar light is equal to 100) can be used Illuminant that allow to put into practice the so-called “technique of corresponding colors”, for which a color, or a nuance, it is illuminated by a light color.
The most difficult color
What is the color of a work of art more difficult to illuminate with these light emitting diodes? Surely the white: a white LED fact does not exist, but you can get by using blue LEDs with emissions of between 430 and 480 nm which spread phosphors luminoconversione, ie salts of yttrium treaties: the result is a peak blue and one yellow , integrated by the human eye, you can see the whites.
A specter balanced
The spectrum ideal for illuminating the artifacts is however the so-called balanced spectrum, defined according to the painted surface on which it is directed, and all its component colors. It is developing by combining the white light – obtained by combining blue LEDs and phosphors luminoconversione – with the addition of specific dominant wavelengths, consisting of LED red, green and blue. The realization of a good lighting also contribute a correct light dose, the so-called color temperature, and the direction of light, precious to solve some color differences unintended and to make more contrasts. Widespread solution and homogeneous, and without underscores theater , which has been chosen for the Sistine Chapel.
January 31, 2016 (modified January 31, 2016 | 15:09)
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