What's the Light Intensity would be the best?

John Ames

John Ames

Member
I was just curious if anyone had played around with lowering the intensity of the light during late bloom, early ripening stage. What's the intensity would you use? and how about the effect?
 
Rurumo

Rurumo

Well-Known Member
I think lowering the intensity towards the end is worth experimenting with, once the buds have essentially stopped growing and just keep getting denser. They are using less nutrients at that point, I don't think they need to be pushed hard any longer, and it might end up helping to preserve the good terpenes you get towards the end (lower temps too). I bet you could lower it up to 20% for the final 2 weeks without losing much/any yield. I haven't tried it yet, but I've thought about it.
 
Star Dog

Star Dog

Well-Known Member
I'd thought about this to but anytime I asked about doing it the reply was to the effect of max to the end?

My own observations there's too much light at the end if you're running near max light for the duration, when things slow down i back the light off a bit.
 
Blue brother

Blue brother

Well-Known Member
I’d read somewhere that red light is counter productive when we’re trying to build secondary metabolites towards the end, the findings of the study was that dropping the dli reduced the amount in the end product, but swapping red photons for blue photons produced an end product with larger amounts of these goodies.
I’ll see if I can find it over the weekend for you, I know @Kassiopeija knows his googlechromes from his phytochromes so he’s probs forgot more about this subject than I can remember and might chime in
 
7CardBud

7CardBud

Well-Known Member
Blue brother said:
I’d read somewhere that red light is counter productive when we’re trying to build secondary metabolites towards the end, the findings of the study was that dropping the dli reduced the amount in the end product, but swapping red photons for blue photons produced an end product with larger amounts of these goodies.
I’ll see if I can find it over the weekend for you, I know @Kassiopeija knows his googlechromes from his phytochromes so he’s probs forgot more about this subject than I can remember and might chime in
Click to expand...
Growing has gone through many fads. I remember about 10-15 years ago it was popular to finish with actinic coral bulbs in the 10K-12K range.
People would add them in with a HPS or switch over to a big T5 fixture with the bulbs.

I never followed the results much since those coral tubes were extremely expensive at the time.
 
Blue brother

Blue brother

Well-Known Member
7CardBud said:
Growing has gone through many fads. I remember about 10-15 years ago it was popular to finish with actinic coral bulbs in the 10K-12K range.
People would add them in with a HPS or switch over to a big T5 fixture with the bulbs.

I never followed the results much since those coral tubes were extremely expensive at the time.
Click to expand...
Yeah I remember it, same with the 10k metal halides that are sold as “finishing lights”, problem is a direct swap is usually watt for watt and blue lamps usually produce far less photons than red lamps, so photosynthesis slows down and so does other processes that are responsible for conversions and synthesis of valuable compounds, I just saw a video the other day of dr Bruce talking about reducing intensity and saying it was a bad idea to stray from optimal as it stalls these processes, but from what I’ve read it is beneficial to reduce red light while increasing blue light before harvest if we’re hoping to harvest the greatest amount of therapeutic compounds
 
John Ames

John Ames

Member
Blue brother said:
I’d read somewhere that red light is counter productive when we’re trying to build secondary metabolites towards the end, the findings of the study was that dropping the dli reduced the amount in the end product, but swapping red photons for blue photons produced an end product with larger amounts of these goodies.
I’ll see if I can find it over the weekend for you, I know @Kassiopeija knows his googlechromes from his phytochromes so he’s probs forgot more about this subject than I can remember and might chime in
Click to expand...
Thx in advance for share!
 
John Ames

John Ames

Member
Star Dog said:
I'd thought about this to but anytime I asked about doing it the reply was to the effect of max to the end?

My own observations there's too much light at the end if you're running near max light for the duration, when things slow down i back the light off a bit.
Click to expand...
Do you test the PPFD in each different stage and to keep the best light Intensity for the plants?
 
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