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“Then God said, “Let there be light”; and there was light. God saw that the light was good; and God separated the light from the darkness.”Genesis 1:3-4As we can read from the quote above light was always an important subject for the humankind. It has been used throughout the ages as a tool for experiencing and discovering the world around us. Without light our horizons would only be limited to the short distance of our other senses and that’s the reason that some people fear darkness, for it is a fear of not knowing what can be lurking in the shadows.But for there to be light, there also must be some source of power and in our modern daily lives, we don’t consider the challenges put forth before us when it comes to saving energy. The technology around us needs the constant rise of energy production, we demand more as we consume more. Therefore, in the Age of exponential rise of energy demand we must also think of making the technology we use more efficient, allowing Humanity to catch up with power production, which nowadays, would be most desirable to be from sustainable (also carbon neutral) energy production. One of such example of achieving higher and higher efficiency is the advent of LED lighting, which is becoming the standard choice for almost any new lighting installations, be it industrial or consumer market. It may come from two simultaneous sources, the first may be described as the drive for the companies to be environment friendly and to be carbon-neutral may by inspiring for the companies to seek out this form of advertising itself and the second reason may be that becoming efficient at power consumption also brings both short- and long-term savings.In this work, I would like to explore the less highlighted subject of quality of lighting, especially in the field of luminous flux pulsations (or temporal light artefacts, TLAs), which based on some studies, can and do influence human subjects most notably when dealing with such lighting sources on a daily basis. In such settings luminous flux pulsations are rarely visible for direct conscious eye sight, since its frequency exceeds the so-called critical frequency, above which the human brain starts merging flashes. This phenomenon has negative effect on humans and can induce increased levels of stress. The negative impact of flicker accumulates over time, resulting in increased fatigue of the eyes, trouble with concentration especially with complex tasks and also can result in headaches or migraines. When pulsating light is used for illumination can bring even more physical harm in the form of stroboscopic effect. This kind of effect can be marked with life-threatening danger, when the pulsations frequency is equal or a multiple of the frequency of rotation or a movement of a given object, it can be perceived as completely stationary or moving not with its true speed or direction of movement. An easy to imagine example of such danger would be operating in lighting conditions where such an effect is present a circular saw, high power electric motor, spinning mills or in-factory heavy duty cutting machinery.For better understanding of the problem I have been tasked with designing and constructing a device being cable of simulating flicker using a DC power source and LEDs.  allows to simulate many scenarios of the luminous flux pulsation.

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