We begin a new series of posts, the first is about BIM, the area of study in my introduction to scientific research, and this, about artificial lighting. To initiate the study of lighting, we first need to understand the basics of optics.
Our study of light will be about a small part of the light spectrum. This part of the spectrum is called visible light. It contains the electromagnetic radiantion between 380 to 760 nm.
Each type of lighting source will work the spectrum with his particularies. The warm bodies will create a continuous spectrum, while rarefied gases create a spectrum of rays and gases at high pressures create a spectrum of bands.
The first image represents the spectrum made by a warm body, such as an incandescent lamp, the second image represents the spectrum of a rarefied gas, and the last represents a spectrum of bands.
The concept of lighting spectrum is an important idea to understant an important factor for choosing the type of lamp, the CRI. CRI ( Color Reprodution Index) is the amount of color that the lamp can reproduce, in other words, the ability of the lamp to create the visible spectrum. Lamps tha operates by heating has an CRI of 100%, because their spectrum are continuous. Lamps made of rarefied gas has a lower CRI, because there are lacks of colors in his spectrum, like lamps made of high-pressure gases.
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