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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
The Influence of Temperature to Change Operational Parameters and Lifetime of Powerful LEDs
 Zeman, Milan ; Pavelka, Tomáš (referee) ; Krbal, Michal (advisor)
The aim of this bachelor’s thesis is the introduction of changes in operating parameters and lifetime period of LED module. The theoretical part is dedicated to a principle of light, the development and use of LED. The main emphasis is placed on PN junction degradation due to temperature and lifetime period of the LED module. The practical part of this thesis contains measuring of LED diode Cree XLamp XR-E in the course of temperature from 0°C to 90°C in the current range of 0-300% of nominal value. Efficiency of LED operation is highly dependent on PN junction temperature. When powering the LED to approximately 65% of the rated power, the conversion of electric energy to light is the most efficient. It depends on junction temperature because increasing temperature decreases efficiency. A very important factor when designing the lighting system is cooling which helps to dissipate heat from the chip.
Detailed record
The Influence of Temperature to Change Operational Parameters and Lifetime of Powerful LEDs
 Zeman, Milan ; Pavelka, Tomáš (referee) ; Krbal, Michal (advisor)
The aim of this bachelor’s thesis is the introduction of changes in operating parameters and lifetime period of LED module. The theoretical part is dedicated to a principle of light, the development and use of LED. The main emphasis is placed on PN junction degradation due to temperature and lifetime period of the LED module. The practical part of this thesis contains measuring of LED diode Cree XLamp XR-E in the course of temperature from 0°C to 90°C in the current range of 0-300% of nominal value. Efficiency of LED operation is highly dependent on PN junction temperature. When powering the LED to approximately 65% of the rated power, the conversion of electric energy to light is the most efficient. It depends on junction temperature because increasing temperature decreases efficiency. A very important factor when designing the lighting system is cooling which helps to dissipate heat from the chip.
Detailed record

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