July 2024 - 6

LIGHTING RESEARCH
SUPPLEMENTAL strategies
Let your plants
control the conditions
BY SUYUN NAM, MARC W. VAN IERSEL AND RHUANITO S. FERRAREZI
L
ight is a crucial factor affecting plant growth,
especially during the winter or on cloudy days.
To ensure optimal crop yield and quality, growers
often utilize supplemental lighting strategies such as
HPS or LED lights, but the high installation and electricity
costs associated with these lights can reduce or
eliminate profitability.
It's essential to strike a balance between the
energy input for lighting and the resulting increase in
productivity and profits. In response to this challenge,
various " smart " lighting control strategies have been
explored. While HPS remains popular, dimmable LEDs are
increasing in utilization since they offer precise control
with higher energy efficiency.
One straightforward lighting strategy is to add a
certain amount of supplemental light over the sunlight.
Supplemental lighting is also used to extend the
photoperiod, providing additional light at dawn and dusk.
However, it is crucial to consider whether your crops are
sensitive to day length, especially concerning flowering
or fruiting.
6
JULY 2024 GPNMAG.COM
FEBRUARY 2024 GPNMAG.COM
There is an advanced lighting control strategy, also
called an adaptive lighting system, that can dynamically
adjust supplemental light levels based on changing
sunlight conditions (van Iersel and Gianino, 2017).
When sunlight is ample, supplemental light levels are
decreased or switched off, while they are increased under
insufficient sunlight.
It makes sense to provide more supplemental lighting
under low sunlight conditions because plants use light
less efficiently when they are exposed to high light levels,
matching the light use efficiency.
EFFICIENCY
Light use efficiency refers to how efficiently plants use
light energy to grow. For sure, we hope our crops use
supplemental lighting as efficiently as possible so that
we can save electrical costs, since light level is one of the
biggest factors affecting light use efficiency. However, the
light use efficiency varies also with other environmental
factors such as temperature, humidity and carbon
dioxide levels.
LIGHTING

http://www.GPNMAG.COM

July 2024

Table of Contents for the Digital Edition of July 2024

Table of Contents
Editor's Report | Summertime decisions
Lighting Research | Supplemental lighting strategies
Technology | Transforming with automation
CAST 2024 | Remarkable releases for 2025
CEA | The importance of canopy ventilation
Climate Control | Enhancing greenhouse management
Special Advertising Section | Grower's Guide: Professional Growing Media and Biologicals
Variety Information | New take on smooth hydrangeas
Big Grower | Hydroponic farming
Product Showcase
Plant Health | Setting ground rules
Forty Under 40 Perspectives | Turning a lifelong education into a business
Culture Report | Grama grass
Technically Speaking | Why crops don't flower (on time)
Product Marketplace
Industry News/Events
Classifieds/Ad Index
July 2024 - 1
July 2024 - 2
July 2024 - Table of Contents
July 2024 - Editor's Report | Summertime decisions
July 2024 - 5
July 2024 - Lighting Research | Supplemental lighting strategies
July 2024 - 7
July 2024 - 8
July 2024 - 9
July 2024 - 10
July 2024 - 11
July 2024 - Technology | Transforming with automation
July 2024 - 13
July 2024 - 14
July 2024 - 15
July 2024 - CAST 2024 | Remarkable releases for 2025
July 2024 - 17
July 2024 - 18
July 2024 - 19
July 2024 - 20
July 2024 - 21
July 2024 - 22
July 2024 - 23
July 2024 - 24
July 2024 - 25
July 2024 - 26
July 2024 - 27
July 2024 - CEA | The importance of canopy ventilation
July 2024 - 29
July 2024 - 30
July 2024 - 31
July 2024 - 32
July 2024 - 33
July 2024 - Climate Control | Enhancing greenhouse management
July 2024 - Special Advertising Section | Grower's Guide: Professional Growing Media and Biologicals
July 2024 - A2
July 2024 - A3
July 2024 - A4
July 2024 - A5
July 2024 - A6
July 2024 - A7
July 2024 - A8
July 2024 - A9
July 2024 - A10
July 2024 - A11
July 2024 - A12
July 2024 - A13
July 2024 - A14
July 2024 - A15
July 2024 - A16
July 2024 - Variety Information | New take on smooth hydrangeas
July 2024 - 36
July 2024 - 37
July 2024 - 38
July 2024 - 39
July 2024 - 40
July 2024 - Big Grower | Hydroponic farming
July 2024 - 42
July 2024 - 43
July 2024 - 44
July 2024 - 45
July 2024 - 46
July 2024 - Product Showcase
July 2024 - Plant Health | Setting ground rules
July 2024 - 49
July 2024 - 50
July 2024 - 51
July 2024 - Forty Under 40 Perspectives | Turning a lifelong education into a business
July 2024 - 53
July 2024 - Culture Report | Grama grass
July 2024 - 55
July 2024 - 56
July 2024 - 57
July 2024 - Technically Speaking | Why crops don't flower (on time)
July 2024 - 59
July 2024 - Product Marketplace
July 2024 - 61
July 2024 - 62
July 2024 - 63
July 2024 - 64
July 2024 - Industry News/Events
July 2024 - Classifieds/Ad Index
July 2024 - 67
July 2024 - 68
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