This thesis deals with the topic of energy efficiency of LED diode and light-emitting lights that are made of them. In the theoretical part, we focus primarily on a brief historical overview of the development of lights, among which we explain more precisely how LED diodes and lights have evolved and shaped over time. Following we describe different types of lamps and define how LED lamps differ from them, and how these differences affect their higher energy efficiency. LED lamps allow the consumption of electricity, which is more rational than the use of other types of lamps, such as, e.g., classical filament lamps that consume more electricity and emit less light. Similarly, compared to LEDs, their life span is shorter. The diploma points out some advantages of the LED lamps, and points to some of their weaknesses, which are mainly reflected in price and their temperature sensitivity. In the last section, we address questions about the effectiveness of LED lamps, focusing on their energy efficiency, the light pollution and the recycling of LEDs. At the end we present the findings of comparison analysis of costs which was hypothetically made for four-member household.
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