Light Quality and Measurements Flashcards

1
Q

What is the electromagnetic spectrum and what does it measure?

A

Streams of photons traveling in a wave-like pattern
Measures electromagnetic radiation

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2
Q

How are visible light and photosynthetically active radiation (PAR) related?

A

PAR is a subset of visible light

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3
Q

What are the differences between light quality, intensity, and distribution/quantity?

A

Quality: measure of usable light that is available for plant use
Intensity: brightness of light
Duration: how long the light is available

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4
Q

What are the units of measurement for each ways of approaching light?

A

Lumens (brightness to human eye)
Lux (brightness in an area)
Watts (energy required to produce light)
PPF (measure of plant usable light per second)
PPFD (PPF measurement as it hits a surface)

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5
Q

What types of light are best for horticultural production?

A

LED (most efficient, degrade over time)
Sodium (last a long time, produce heat)

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