It is known that LEDs consist of a semiconductor chip which emits light energy near ultraviolet level and phosphors which converts the energy into radiation of a wide spectrum, which is visually perceived as a white color. The luminous flux is directly dependent on the radiation power of the crystal which is directly proportional to the operating current and inversely proportional to the transition temperature. It is obvious that the radiation increases with increasing current and decreases with increasing temperature.
From the viewpoint of saving the most important is the indicator of the light output: radiation power ratio to the power consumption.
It therefore becomes apparent the use of modern energy-saving lighting. But, unfortunately, modern lighting systems have their drawbacks:
1. The rather high price,
2. Lack of proper use experience,
3. A large number of defective products,
4. Parameters of the light sources do not meet the standard documentation,
5. Elevated pulsation of light. Let’s consider how the ripple of light effects on the human body.
In der praktischen Leuchttechnik ist es üblich, die Lichttemperatur, die von verschiedenen künstlichen Lichtquellen wiedergegeben wird, mit natürlichen Lichtquellen zu vergleichen.