leds endless possibilities for lighting · led light –general info led light history efficacy...
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LEDs – endless possibilities for lighting
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Dr. Zhelio Andreev
Würth Elektronik eiSos GmbH & Co. KG
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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…
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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
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Chuang et al., Quantum Electronics, IEEE Journal of. 33. 970 - 979.
𝑅𝑡ℎ = 𝑅𝑗𝑐 + 𝑅𝑐𝑝𝑐𝑏 + 𝑅𝑝𝑐𝑠ℎ𝑠 + 𝑅ℎ𝑠𝑎
𝑇𝑗 = 𝑇𝑎 + 𝑅𝑡ℎ ∗ 𝑃𝑑𝑖𝑠𝑠
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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
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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
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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
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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
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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.
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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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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?