LED ACADEMY>1. LED´s Basics>2. LED´s Optics>3. LED´s Thermal>
- 3.1 Introduction
- 3.2 Heat transfer introduction
- 3.3 Power conversion
- 3.4 LED performance
- 3.5 Thermal design of LED-based luminaire
- 3.6 Cooling system
- 3.7 Thermal design of passive cooling
- 4.1 Cold lumens versus hot lumens
- 4.2 Driving LEDs
- 4.3 LED connection
- 4.4 LED driver
- 4.5 LED driver additional features
- 5.1 High Efficacy
- 5.2 Controllability
- 5.3 Size
- 5.4 Directionality
- 5.5 Durability
- 5.6 Low-temperature operation
- 5.7 Instant on, frequent switching
- 5.8 No UV emissions
- 5.9 Environmental impact
- 5.10 Reliability and lifetime
- 6.1 The Right Light Application
- 6.2 Presentation and retail shop, shopping mall
- 6.3 Industry and engineering, outdoor workplaces
- 6.4 Office and communication
- 6.5 Hotel and gastro
- 6.6 Architecture, facade, city marketing and visual presentation
- 6.7 Road path and square
- 6.8 House, flat and living area
- 6.9 Emergency lighting
- 7.1 High brightness LED market
- 7.2 Lighting Efficiency Comparison
- 7.3 HB LED
- 7.4 LED luminaire cost track
- 7.5 LED retrofits versus LED luminaires
3.2 Heat Transfer
In case of traditional light sources such as incandescent or fluorescent lamps the heat is transferred from light source to the ambient in the same direction as a visible light via infrared (IR) radiation. Since LED emits only a few IR radiation, heat transfer is possible predominantly by conduction and convection. Active area of LED has to be kept at lowest possible temperature during operation (up to 70 °C by a rule of thumb).
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Thermal design is essential for overall design of LED-based luminaires. Fixture with improper thermal management causes heat accumulation in an active area of LED leading to its damage.
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Unlike the traditional light sources LED heat dissipation depends mainly on Conduction & Convection. Heat produced by LED light source has to be conducted away in most efficient way in order to ensure optimal performance of a luminaire. |
| 3.3 Power Conversion | ||
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