Seeking Spectrum advice for bloom

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Bud man 43

Well-Known Member
TimewasterOG said:
Looking beautiful my friend! Well done, looks like you’re pushing them to their limit with that little bit of tip burn, but no other issues evident.
So you’re suggesting I dial down the blue end of the spectrum? Your results are pretty great
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UV and far red promote stronger plant growth with heavier flowers. Far red promotes increase in plant biomass, triggers flowering and improves the efficiency of the total spectrum.
Blue light is necessary, sometimes used for sexing and promotes thicker stems.
Most lights are 2 to nearly 20x more in the red spectrum than blue. The Mitra Bellatrix Heliospectrs LED does have one of the highest percentage of blue spectrum available, 24% blue and 40% red- 36% green
Once again- in the fall the sun light is at a lower angle which makes more light in the red and orange spectrum. Mother Nature-
 
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Boatguy

Boatguy

Well-Known Member
Bud man 43 said:
UV and far red promote stronger plant growth with heavier flowers. Far red promotes increase in plant biomass, triggers flowering and improves the efficiency of the total spectrum.
Blue light is necessary, sometimes used for sexing and promotes thicker stems.
Most lights are 2 to nearly 20x more in the red spectrum than blue. The Mitra Bellatrix Heliospectrs LED does have one of the highest percentage of blue spectrum available, 24% blue and 40% red- 36% green
Once again- in the fall the sun light is at a lower angle which makes more light in the red and orange spectrum. Mother Nature-
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Grow Lights Australia's highlight 420 is a pretty kickass full spectrum light.
If it weren't for the shipping i would have a couple.
growlightsaustralia.com

High Light 420 "Gen2" LED Panel - Grow Lights Australia

High Lights are the first “true” full-spectrum LED grow lights that go all the way from 400-800nm including UVA and Far Red on one channel.
growlightsaustralia.com growlightsaustralia.com
 
D

Delps8

Well-Known Member
TimewasterOG said:
I have a bar type led with the ability to program red, blue and uv spectrums and am wondering if I’ve had things set up right. I’ve had a sunrise/sunset with the blue increasing/decreasing from 25% to 100% over an hour; and the red starting at 75% and going right to 100% after 15 minutes.
my question is basically this: should I be running blue spectrum at 100%, or should I dial it down a bit? I’m wondering if it’s contributing to longer flower times - I’ve had to run 8 week strains as long as 10 before trichomes are ready to start cutting.
Thanks in advance for any suggestions!
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Blue photons inhibit cell expansion. Veg (blue) lights are designed to keep plants short and compact. Red photons promote cell growth and they generate about double the photons that you get from the same input into a blue LED. Light color influences plant shape but when it comes to yield, the quantity of photons (PPFD & DLI) are what matters.

One Bugbee study demonstrates how yield decreases as the percentage of blue photons increases from 4% to 20%. That's why "flower" lights (LED's from HLG and Growcraft + HPS) have very little blue in favor of red.

Were I in your shoes, I'd head on over the Growcraft site and study the picture of their spectrum and you might be able to mine the third party analysis that they make available. You can get some info on that here.

BTW, I use a Growcraft veg light and a Growcraft flower light. The change in plant height after switching on the flower light is startling even though the DLI is pretty much the same (growing autos).
 
TimewasterOG

TimewasterOG

Active Member
Delps8 said:
Blue photons inhibit cell expansion. Veg (blue) lights are designed to keep plants short and compact. Red photons promote cell growth and they generate about double the photons that you get from the same input into a blue LED. Light color influences plant shape but when it comes to yield, the quantity of photons (PPFD & DLI) are what matters.

One Bugbee study demonstrates how yield decreases as the percentage of blue photons increases from 4% to 20%. That's why "flower" lights (LED's from HLG and Growcraft + HPS) have very little blue in favor of red.

Were I in your shoes, I'd head on over the Growcraft site and study the picture of their spectrum and you might be able to mine the third party analysis that they make available. You can get some info on that here.

BTW, I use a Growcraft veg light and a Growcraft flower light. The change in plant height after switching on the flower light is startling even though the DLI is pretty much the same (growing autos).
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Thanks for the info! I’ll check that out!
 
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