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!