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Feedback/Opinions Required - Meijui 240w UV+IR


Q9550
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Hi All,

Looking to get a new light for my recently purchased tent.

I have a 2x4 Mars tent and currently running a ModuGrow 90w + 2x 30 ModuGrow diy boards.

Looking to upgrade to a new QB from Meijiu and have been offered a light at a good price I think.

https://www.alibaba.com/product-detail/Meijiu-Qb288-Lm301B-288-Board-240W_1600273410022.html?spm=a2700.12243863.0.0.117c3e5fUPT0w8

Looking for any input or advice regarding this light, I can get it with shipping for $176

Any concerns or am I over thinking this? lol

Kind Regards

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1 hour ago, Q9550 said:

Shot for the reply bro.

Is the UV + IR required? I can always just do the simple board with added 66nm

Unfortunately, science says that LEDs do not emit UV-B radiation which is beneficial to plants and most living things in moderation, and only output moderate UV-A light which isnt as useful to plants, and absolutely zero UV-C which is the dangerous UV spectrum. UV is best supplied using additional supplemental flourecent tubes designed to output UV-B. so the UV diodes are a small waste as technology isnt there yet.

and the IR is useful for flowering plants who use large amounts of red light to grow... the red also increases vertical growth which can be good or it can be bad if you arent aware of this fact.

all in all, its better to have them than not have them - but you dont neeeeeed them

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2 hours ago, Q9550 said:

Shot for the reply bro.

Is the UV + IR required? I can always just do the simple board with added 66nm

UV from LED is a waste for cannabis (for now at least).

IR is often classified as 730nm and not 760nm+

The 660nm + 730nm leads to the Emerson effect

 

Not needed. Can be nice to have if you want though.

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2 hours ago, CreX said:

Unfortunately, science says that LEDs do not emit UV-B radiation which is beneficial to plants and most living things in moderation, and only output moderate UV-A light which isnt as useful to plants, and absolutely zero UV-C which is the dangerous UV spectrum. UV is best supplied using additional supplemental flourecent tubes designed to output UV-B. so the UV diodes are a small waste as technology isnt there yet.

and the IR is useful for flowering plants who use large amounts of red light to grow... the red also increases vertical growth which can be good or it can be bad if you arent aware of this fact.

all in all, its better to have them than not have them - but you dont neeeeeed them

Bro! Thank you for this, exactly the kind of info I was looking for. I think they caught me with the marketing tactics lol

I am happy to go with the normal boards + 660nm

Would have been nice to have, but if its not going to make much difference then would rather get the extra 660nm pieces.

 

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14 hours ago, Q9550 said:

Bro! Thank you for this, exactly the kind of info I was looking for. I think they caught me with the marketing tactics lol

I am happy to go with the normal boards + 660nm

Would have been nice to have, but if its not going to make much difference then would rather get the extra 660nm pieces.

 

This is just going to boost the red a bit.

It would be more beneficial if you were to get additional 660 + 730 diodes. This would boost red and photosynthesis.

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On 8/31/2021 at 8:37 AM, PsyCLown said:

This is just going to boost the red a bit.

It would be more beneficial if you were to get additional 660 + 730 diodes. This would boost red and photosynthesis.

Thanks bro, this got me doing a bit more research last night on 660nm + 730nm

From what I gather the 660nm helps boost red for flowering and the 730nm helps wake up or put the plants to sleep faster.

730nm should be used 10/15mins before and after the mains lights switch for the sleep/wake up effect.

If 660nm + 730nm is used together then this help with photosynthesis and also reduces flowering times.

Please correct me if I am wrong, there is a ton of info out there with so many varying opinions.

 

My issue now is that I cannot get the boards with only 660nm + 730nm

If I want the 730nm diodes I will have to go with the original board I posted.

This has reduced 660nm diodes:

https://www.alibaba.com/product-detail/Meijiu-Qb288-Lm301B-288-Board-240W_1600273410022.html?spm=a2700.12243863.0.0.117c3e5fUPT0w8
image.png.a40e3d6beef3184c7e4b8b8bf39d9ad6.png 

VS

https://meijiu.en.alibaba.com/product/1600204627439-900283355/Meijiu_Daisy_Chain_Lm301b_Lm301h_Veg_Diy_qb288_qb_288_Board_240w_240_watt_Samsung_pcb_pcba_ir_5000k_sf2000_Meiju_Led_Grow_Light.html?spm=a2700.shop_plgr.41413.12.5a0f621dzVWDWr

image.png.e6ebc48ea120c5dce667d197ca6f64b1.png

 

This is all still so very confusing, never had these issues with HPS LOL

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Thanks bro, this got me doing a bit more research last night on 660nm + 730nm
From what I gather the 660nm helps boost red for flowering and the 730nm helps wake up or put the plants to sleep faster.
730nm should be used 10/15mins before and after the mains lights switch for the sleep/wake up effect.
If 660nm + 730nm is used together then this help with photosynthesis and also reduces flowering times.
Please correct me if I am wrong, there is a ton of info out there with so many varying opinions.
 
My issue now is that I cannot get the boards with only 660nm + 730nm
If I want the 730nm diodes I will have to go with the original board I posted.
This has reduced 660nm diodes:
https://www.alibaba.com/product-detail/Meijiu-Qb288-Lm301B-288-Board-240W_1600273410022.html?spm=a2700.12243863.0.0.117c3e5fUPT0w8
image.png.a40e3d6beef3184c7e4b8b8bf39d9ad6.png 
VS
https://meijiu.en.alibaba.com/product/1600204627439-900283355/Meijiu_Daisy_Chain_Lm301b_Lm301h_Veg_Diy_qb288_qb_288_Board_240w_240_watt_Samsung_pcb_pcba_ir_5000k_sf2000_Meiju_Led_Grow_Light.html?spm=a2700.shop_plgr.41413.12.5a0f621dzVWDWr
image.png.e6ebc48ea120c5dce667d197ca6f64b1.png
 
This is all still so very confusing, never had these issues with HPS LOL
There are manufacturers who stock these boards and local suppliers who stock boards with 660nm and 730nm.

Really upto you whether you want to go this route or not. Plain 301b diodes work great too without any additional diodes.

Sent from my Redmi Note 7 Pro using Tapatalk

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  • 3 weeks later...

Howsit all,

Just wanted to say a big thank you to all who responded and provided some very valuable information :-greenthumb

I ended up going with a KingBrite J series 240w LM301H with UV+IR (https://tinyurl.com/j240wUVIR), yeah I know it was not even part of the options above lol

Managed to pick it up for USD185 incl shipping, which worked out to about R2600 when I placed the order.

I just felt with the Meijiu boards there was not enough 660nm and UV+IR diodes. The KingBrite has 136pcs 660nm, 8pcs UR and 8pcs IR

Will post back when the light arrives in October.

 

Edited by Q9550
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