Abstract
LEDs are not 100 % efficient at converting input power to light. Some of the energy is converted into heat and must be transferred to the ambient. Two approaches are used to assess the amount of heat generated by the LED - based on the luminous efficacy of radiation and a new one presented in the paper. To provide sufficient accuracy in thermal evaluations closer to the real operating modes for a specific LED module a new technique is developed. The aim is to evaluate the amount of heat generated during design phase of LED lighting. Experiments of LED modules are conducted to evaluate LEDs efficiency at converting input power to heat. For the heat dissipation study and thermal analysis of LED module are used non-contact temperature measurement using an infrared camera combined with computer aided thermal modelling and simulation. DOI: http://dx.doi.org/10.5755/j01.eie.22.2.8522
Highlights
Luminous efficacy of LEDs that can be attained until 2015 is based on the expectation that LEDs will be able to attain 50 % to 70 % of the theoretical maximum
This paper provides a new approach to estimate the amount of heat generated by LEDs in real operating conditions based on Computational Fluid Dynamics (CFD) simulation and thermographic Non-Destructive Evaluation (NDE)
In the presented research we did a practical evaluation of the heat efficiency of LED module Luxeon REBEL White 1W in different working conditions
Summary
Luminous efficacy of LEDs that can be attained until 2015 is based on the expectation that LEDs will be able to attain 50 % to 70 % of the theoretical maximum. The theoretical maximum of the luminous efficacy is 300 lm/W, according J. A key factor for LEDs is their efficiency of energy conversions. The main limitation to this energy conversion is a challenge for LED manufacturers and users [2]. The LED power conversion has two main constituent: electrical power-light conversion and electrical power-heat conversion. Other factors, such as driver efficiency, lighting optical losses, and lighting thermal factors will determine the final energy efficiency of any LED lighting system [3]
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