LEDs endless possibilities for lighting · LED Light –general info LED Light history Efficacy...

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LEDs – endless possibilities for lighting

1

Dr. Zhelio Andreev

Würth Elektronik eiSos GmbH & Co. KG



Overview

LED Lighting – general information

High power LEDs

– Specific details

– Structural details

Applications

Horticulture – what the plant needs

– Specific parameters for plants

– What is a light recipe

– How plants function

Further applications

Summary

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LED Light – general info

LED Light history

Efficacy – with 50 %, most efficient light source

Narrow band emitters

Wavelength and material

– AlINGaN

– AlGaAs / AlGaP

Different sizes and power

1907 – First seen effect of semiconductor

1968 – First emission from LEDs

1994 – Efficient Blue LEDs & White LEDs

And much more to follow…

3



LED Light – application, high power LED, development

High power LEDs

Driving currents – up to 1 A

Power dissipation - up to 3 W

Energy Efficiency ≈ 40-60 %

Applications

– Entertainment lighting

– Architecture lighting

– General lighting

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LED High power – power concentration, thermal effects

Power concentration

Current flow – 1 W/mm2

Thermal effects by LEDs

– Lifetime / degradation

– Cooling – active/passive

No convection – no thermal emissions

– Good – can work close to other surface

– Bad – need cooling

Thermal path - Thermal resistance

Junction temperature and ambient temperature

5

Chuang et al., Quantum Electronics, IEEE Journal of. 33. 970 - 979.

𝑅𝑡ℎ = 𝑅𝑗𝑐 + 𝑅𝑐𝑝𝑐𝑏 + 𝑅𝑝𝑐𝑠ℎ𝑠 + 𝑅ℎ𝑠𝑎

𝑇𝑗 = 𝑇𝑎 + 𝑅𝑡ℎ ∗ 𝑃𝑑𝑖𝑠𝑠



Highlights – Würth LED package

Details of the Würth LED package

PCB design and heat sink are external components

Good thermal design of the package is important

ESD Protection for surge currents

Vertical design – better thermal/electrical flow

6



Products - applications

Applications

From IR to UV

– Night vision

– Security cameras

– Gesture recognition

– Entertainment lighting

– General lightning

– Emergency lightining

– Curing

– Forensics

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Products application - Horticulture

Where electronics goes farming

The need of efficient plant growing

Decrease the path from field to market totable

Do it yourself

Fresh green vegetables for everyone

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What plant sees?

Plant detectors

– Chlorophyll

– Phytochrome

– Supplies energy for photosynthesis

Exlpanation of PPF / PAR

– Light is energy

– Human eye – sensitive to green wavelengths

– Plants “see“ each photon as energy carrier

– Transfer curve - McCree, PAR, DIN

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Physics Humans Plants

Units Watt Lumen µmol/s

Explanation EnergyEye

perception

Photons

count



What plant needs?

Define for which growth phase – which combination of wavelengths are important

Information about different plants processes

– Growing strong root system – germination of plant

– Building up the plant body

– Flowering / fruiting process boost

Activation of different plant processes

– Good-night kiss

– Growth stimulation - shade avoidance

– Blooming/Fruiting – when you want

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Germination recipe

Flowering recipe



Different light recipes

How to design your recipe – mixing different wavelengths

– Number of LEDs

– Driving current

– Temperature

Output values

– PPF, PPFD, Radiant flux, PPE, WPE

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www.we-online.de/redexpert



Reference Design: Multi-channel LED DriverSimple Growbox

How to make your luminaire

– Example - simple Growbox

All products from WE

– Reference design available

– BLE control

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Power

Board

User

Panel LED

Panel



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Reference Design: Multi-channel LED DriverPower Board

VDRM

• 18V-48V VIN; 1,8V-VIN VOUT; up to 450mA

• LDHM LED Step Down High Current Module

• PIC16F1527 Micocontroller

• Switch between VIN and +15V

• VDRM Variable Step Down Regulator

Module QFN-41

• AMBER BLE2126 Bluetooth Module

• Robust screw terminal for VIN and VOUT

• 18 Testpoints



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Reference Design: Multi-channel LED DriverLED Board

No. of

LEDs

Photosynthetic

Photon Flux1

(µmol · s-1)

Photon Flux

Efficiency1

(µmol · J-1)

WL-SMDC

Deep Blue

450 nm

(150353DS74500)

6 13.9 2.07

WL-SMDC

Hyper Red

660 nm

(150353HS74500)

14 34.7 2.96

WL-SMDC

Far Red

730 nm

(150353FS74500)

4 7.76 3.09

WL-SMTC

Warm White

6000 K

(158353060)

4 6.57 1.47

1 PF values are calculated estimates. The data only serves as a reference and does not imply any warranty. The simulated figure is according to the test conditions above. The values and the representation may be

changed and/or updated without notification. This document is strictly confidential. It shall not be reproduced, modified, adapted, or forwarded without the written permission of Würth Elektronik eiSos GmbH & Co. KG.



Applications

Application notes available online

– https://www.we-online.de

Currently available

– General information on Horticulture lighting – the important parameters

– Benefits of horticulture lighting

– How to use the Red and Far red – what is important for them

More application notes to come

Coming soon… – reference design to create own Horticulture box

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https://www.we-online.de/



Applications

UV Light for plants

– Mold prevention

– Storage improvement

– Patogen prevention & plant health

Not only for plants

– Aquarim lights

– Seeweed, corals, fish

– Farm lighting

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Product presentation

Same footprint available in all colors, white, UV and IR

Individually adjustable color spectrum for different plant cultures

Horticulture values available in mW

– No official standard for the measurement

– PAR envelope function is most commonly used

– Values available in the Horticulture Calculator

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Applications

Intercanopy

Vertical Farming

Supplement lighting

Crops

– Tomatoes

– Strawberry

– Lettuce

– Leafy greens

Home grow box

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High power LEDs – most important parameters and what to observe

Applications and available LEDs

Horticulture lighting – what is the difference

How to make a lamp

What is a smart lamp

What parameters are important for the plant

Examples for smart lamp design

LEDs with endless opportunities

Summary

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Thank you for your attention!Questions?

Date post:	18-Oct-2020
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LEDs endless possibilities for lighting · LED Light –general info LED Light history Efficacy...

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