High-bay LED lamp Dolf van Casteren LEDdriven www.leddriven.nl
High-bay LED lamp
Dolf van Casteren
LEDdriven www.leddriven.nl
Nobel prize – Blue LED Incandescent light bulbs lit the 20th century; the 21st century will be lit by LED lamps.
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Lighting revolution
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555 nm (maximum possible luminous efficacy) Truncated 5800 K blackbody
= 683 lm/W = 251 lm/W
LED Industry -The 3rd Growth cycle
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System efficiency
AC power Power supply
P=U•I
LED chip
Phosphor
λblue
λyellow
Luminaire optics
Optical power
Supply < 97 % Electrical efficiency Internal quantum Light extraction
Phosphor Optics Front glass
λblue
Source: J.K.Kim, E.F.Schubert, “Transcending the replacement paradigm of solid-state lighting”, Optics express, 21835, 2008.
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(Fresnel reflection)
< 92 % < 92 %
LED chip efficiency
LED = Electrical efficiency • Internal quantum• Light extraction
Electrical efficiency < 90 % Electrical efficiency = ohmic losses Contacts, doping, tunnel junctions
Internal quantum < 85 %
Extraction efficiency: escape efficiency for photons
Internal quantum efficiency: conversion of electron-hole pairs to photons Major issues: Droop, Green gap, Temperature
Light extraction < 85 %
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Light extraction efficiency
Chip Shaping
Roughening Photonic crystals
Patterned sapphire substrate
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Internal quantum efficiency
8 Reference : Justin Iveland, Lucio Martinelli, Jacques Peretti, James S. Speck, Claude Weisbuch. Direct Measurement of Auger Electrons Emitted from a Semiconductor Light-Emitting Diode under Electrical Injection: Identification of the Dominant Mechanism for Efficiency Droop. Physical Review Letters, 2013
External quantum efficiency
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Major issues: 1. Droop 2. Green gap 3. Temperature
Phosphor efficiency
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phosphor < 90 %
High-efficiency LED lamp
1. Use large LED surface and operate at low current density 2. Operate at low temperature 3. Select high color temperature
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High power LED Medium power LED
Level 0. LED die
Level 1. Packaged die
Level 2. LED assembly
Level 3. LED engine
Level 4. Luminaire
Level 5. Lighting system
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SSL value chain
Ref: C. A. Yuan, C. N. Han, H. M. Liu, W. D. van Driel, “Solid-State Lighting Technology in a Nutshell“ in Solid State Lighting Reliability, Springer, 2013, ch. 2, pp 13-41
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SSL value chain
Chips White conversion
Philips lighting
Osram
Cree
Nichia
Intematix
Zumtobel
Trilux
LEDdriven
Lamp aggregation
Luminaires production
Lighting design
PRE – Power Research Electronics B.V.
• 30 years of experience in power electronics
• 10 years of experience in LED drivers
Business unit LED driven
• Custom made LED drivers solutions
• Partner in innovation
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Custom made LED drivers
LED high-bay lighting
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Traditional high bay lamps
Metal halide lamps Mercury lamps
Philips HPI/CDM HPL
Osram HQI HQL
Sylvania HSI HSL
Nominal Lamp wattage P = > 125 W
Rated Lamp Efficacy = > 75 lm/W
35 Million lamps E.U.
Credit: COMMISSION REGULATION (EC) No 245/2009 of 18 March 2009 implementing Directive 2005/32/EC of the European Parliament and of the Council with regard to eco design requirements for fluorescent lamps without integrated ballast, for high intensity discharge lamps, and for ballasts and luminaires able to operate such lamps, and repealing Directive 2000/55/EC of the European Parliament and of the Council 16
LED high-bay lamp construction
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Conventional mounting with thermal paste
• Temperature difference in heatsink of min. 15 °C.
Mounting with Friction Stir Welding
• Maximum temperature difference in heatsink of 4 °C.
LED high-bay lamp construction
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Temperature simulation
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Air flow simulation
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Optical design
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Batwing 75°
Height lamps = 5.0 m
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Intelligent LED driver
µP lamp driver
Sensors actuators
Network
LED light source
Optics
Cooling
End user
LED high-bay lamp
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• Round High-Bay Lamp Pinput = 165 W
• 97% driver efficiency (patent pending)
• Beam angle: 120, 75, 45 degrees
• 4000K, 6000K, CRI > 80
• Dimming [3 % < P < 100 % ]
• DALI both wired and wireless
• ENEC approval (Luminaire)
• High voltage LED driver
• 24000 Lumen
• > 140 lm/W
• No Inrush current
• Weight 6 kg
LEDdriven
www.leddriven.nl
Thank you for your attention!