What is the importance of far red light?

Advanced Techniques
44

More from my buddy Bruce.

My notes:

Blue photons

  1. can keep plants short and add to flavors.
  2. Not as efficient as red photons.
  3. Enhance red pigments in plants. (red pigments are formed as photo protectants)
  4. High energy
  5. Quickly absorbed

Green photons

  1. work well for people to see.
  2. Helps with canopy penetration
  3. do not use in the dark cycle- plants do see green light, as well as other colors

Red photons are

  1. the most photosynthetically and electrically efficient.
  2. lower energy longer wave length.
  3. Quickly absorbed
  4. is responsible for light bleaching, high fractions of red light and plant don’t make photo protective pigments.

Far red photons

  1. increase stem elongation.

Rapid changes in light matter but not as much as we think.

Plants adapt to new light levels within 1-2 days.

Bruce says 1000-1200 u mols per second, is optimal for cannabis.

Yield increased even beyond 1600 u mols per second.

Double the light, double the water usage.

10% blue is all plants need, more than that may keep plants too short.

Formula for LED light fixture comparison.

  1. U mols out
  2. watts in
  3. price per fixture.

Multiply light sources penetrate the canopy deeper.

This is why big rooms get more weight per light.

A good reason not to prune leaves.

Old lower leaves automatically translocate nutrients and carbon to younger leaves.

A good reason to prune leaves is for airflow, pest prevention, ect.

Here is a link to a Light meter for your phone, dunno if it is any good???
Thought some may find it useful.

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