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Rockwool 4
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"Chapter 4: Light
4.1. Preface
watertank
with the needed accesories
Plant growth involves the conversion of light energy into plant-building
materials (photosynthesis, see chapter 2). Two factors are important for
optimal growth. In the first place, the light intensity. Light intensity
is expressed in 'lumens'. At least 50,000 lumens are needed for growing
indoors. It's not sufficient to add up the number of lumens listed by the
manufacturer for each lamp. The total number of lumens given off is depends
strongly upon good reflection, and proper connecting fixtures and starter
ballasts for the lamps. The quality of the reflector used, and the connecting
fixtures and ballasts determine the light yield for the greatest extent.
For those reasons, self-built sets and home-designed illumination often
deliver a lot less light yield than lamps being used in professional horticulture.
We can improve the light yield in our grow room by applying reflective
material. We haven't painted the walls of the room matt white, and used
reflector caps for the lamps for nothing! The second important factor is
the wavelength of the light. For the production of chlorophyll, and an
optimum photosynthetic reaction, light from the blue spectrum (445 nanometers),
and light from the red spectrum (650 nanometers) is necessary. Blue light
ensures optimal phototropism. Phototropism is the phenomenon which causes
plants to grow towards the light, and to spread their leaves in such a
way to receive the most light.
4.2. Choices for lamps
In this book, we prefer high-pressure sodium lamps, and mercury-iodide
lamps for illumination. Ordinary light bulbs"
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