Lighting Ideal breakdown of PPFD by wavelength

[ScienceSeeker]

Hello,

Considering 750 PPFD to be good PPFD, how much of each type of wavelength should be there in it by percentage ?

Eg .. say .. 3% UVa and UVb , 25% blue spectrum (400 to 500nm), 70% red spectrum, 2% ir spectrum .. etc .. for various stages?

Thanks.

 

[Dichoti]

Hello,

Considering 750 PPFD to be good PPFD, how much of each type of wavelength should be there in it by percentage ?

Eg .. say .. 3% UVa and UVb , 25% blue spectrum (400 to 500nm), 70% red spectrum, 2% ir spectrum .. etc .. for various stages?

Thanks.

I'd ask @BigSm0 @MarshydroTina or one of the other lighting folks on here. You'd figure they could answer.

 

[Mañ'O'Green]

Hello,

Considering 750 PPFD to be good PPFD, how much of each type of wavelength should be there in it by percentage ?

Eg .. say .. 3% UVa and UVb , 25% blue spectrum (400 to 500nm), 70% red spectrum, 2% ir spectrum .. etc .. for various stages?

Thanks.

No easy answer to that. It changes with age of the plant and strain. The sun changes all day long as the angle changes as well as the season. We are trying to duplicate that indoors with artificial light. I personally grow with Citizen 3500K 90 cri COBS with two royal blue COBs in veg and two AgroMax 10000K UVA Plus 48" t5s in mid flower on.

 

[ScienceSeeker]

Hi,
Tried my best to search for such info, couldnt find break down of LED mix.
Now searching thorlabs site to get some clues ..
The problem is LED is available nearly for every wavelength .. too much choice is confusing me.
Here, have a look .. https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=2814
Yikes !!

thanks !!

 

[Black Sail]

It's a lot easier to go by color temperature on the kelvin scale than by percentages. You can't go wrong with a 50/50 blend of 3000K 90CRI (red heavy, more for flower) and 3500K 80CRI (blanced red/blue for full cycle growth). Put them on separate drivers so you can dim them independently to adjust your spectrum.

Responses to color temperature are very strain dependent so there's no "ideal spectrum". The best thing to do is stay in that 3000K-5000K range and to have two different colors that you can adjust independently.

 

[Black Sail]

 

[ScienceSeeker]

So sorry for late reply. Thank you very much. This is exactly what I was looking for.

 

[Black Sail]

So sorry for late reply. Thank you very much. This is exactly what I was looking for.

No problem homie! Check out my forum if you get a chance