Design LED GrowLight Side Bar as supplement, Need comment on Spectrum Design

Hi Guys.
I am designing a LED grow light side bar product as a supplement lighting. Lets say the purpose of this product is to use it during the final 2-3 weeks of the flowering phase as a boost. How would you design the spectrum? Product should have a output of 40-60w.

I have people telling me 70%blue, 30%red. and there are people telling me 70% UVB( 380nm) and 30% white (3000k). I know UVB is good for the plant, but not sure if 70% is too much.

If you can share some comment, that will help me a lot.

Best
leo

TS-leo said:

Hi Guys.
I am designing a LED grow light side bar product as a supplement lighting. Lets say the purpose of this product is to use it during the final 2-3 weeks of the flowering phase as a boost. How would you design the spectrum? Product should have a output of 40-60w.
leo

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it depends on what your supplementing. hard to make a generic product.

380nm is in the uv-a spectrum, not uv-b. That being said, I would like to know how well they work and look forward to seeing your results. I have entertained thoughts of making supplemental light with 365nm, 390nm and 660nm to supplement some 3000k cree cobs. My idea was to use stacked angled aluminum to make my own heatsinks with magnets attached to the back. Using yard sticks mounted to the cabinet walls I would be able to move them up and down with the canopy.

grouch said:

380nm is in the uv-a spectrum, not uv-b. That being said, I would like to know how well they work and look forward to seeing your results. I have entertained thoughts of making supplemental light with 365nm, 390nm and 660nm to supplement some 3000k cree cobs. My idea was to use stacked angled aluminum to make my own heatsinks with magnets attached to the back. Using yard sticks mounted to the cabinet walls I would be able to move them up and down with the canopy.

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you're gonna have problems using magnets on aluminum

grouch said:

380nm is in the uv-a spectrum, not uv-b. That being said, I would like to know how well they work and look forward to seeing your results. I have entertained thoughts of making supplemental light with 365nm, 390nm and 660nm to supplement some 3000k cree cobs. My idea was to use stacked angled aluminum to make my own heatsinks with magnets attached to the back. Using yard sticks mounted to the cabinet walls I would be able to move them up and down with the canopy.

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I have seen growers on RIU use the 365 - 385 nm UVA leds, and they seem to do the job as UVB leds but with a bit of safety. ymmv but my conclusion is that a full on UVB is not needed and is probably more damaging than desired.

mc130p said:

you're gonna have problems using magnets on aluminum

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I'll use glue on the aluminum side. The magnets were planned for sliding up and down the yard sticks.

PurpleBuz said:

I have seen growers on RIU use the 365 - 385 nm UVA leds, and they seem to do the job as UVB leds but with a bit of safety. ymmv but my conclusion is that a full on UVB is not needed and is probably more damaging than desired.

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Any links