QB boards with Cree 660nm

Discussion in 'LED and other Lighting' started by Ivik, Apr 11, 2019.

  1.  
    Ivik

    Ivik Member

    Hi guys

    I'm looking into buying QB boards and I have 2 configurations I wanted to check with you all.
    I will buy 2 heat sinks, depending on conf they will be either 940mm or 900mm in length.

    Each heat sink will have 3 qb boards on them, the difference will be number of white Samsung lm301b and Cree 660nm leds.

    The boards are 3500k so little more blue spectrum then 3000k and using extra the Cree 660nm will give more red spectrum for better bloom.


    Conf1
    2 heat sinks with 3 boards on each with 1512 lm301b leds AND 216 cree 660nm leds, total 1728 leds.
    Each heat sink with 3 boards will have one HLG-320H-48B driver.

    Conf2
    2 heat sinks with 3 boards on each with 1728 lm301b leds AND 48 cree 660nm leds, total 1776 leds.
    Each heat sink with 3 boards will have one HLG-320H-54B driver.


    So as you can see Conf1 has 216 less lm301b leds BUT 168 more Cree 660nm leds AND total 48 leds more.


    So my question is which one would you guys prefer and why?
    Would you guys go for more (+216) lm301b leds and only having 48 Cree 660nm but also 48 more leds in total?
    OR
    Would you prefer having less (-216) lm301b leds but much more (+168 Cree 660nm leds and also 48 less leds in total?


    Those of you that are familiar with HLG QB v2 boards, imagine those boards and the layout they have.
    Conf1 has 2 leds rows taken out and instead have Cree 660nm in those places (picture 1).

    Conf2 has the exact same layout as HLG QB boards but also added 8 Cree 660nm leds in between rows (picture 2).
     

    Attached Files:

    coreywebster likes this.
  2.  
    Airwalker16

    Airwalker16 Well-Known Member

    Both are legit but could you get blue diodes too? If so, I'd do all 3000K with 54 blues and 162 reds.
     
  3.  
    Ivik

    Ivik Member

    I don't know as much as I want when it comes to led, so bare with me if questions are a bit stupid :D

    Why would I get more blue diodes? The showed me spectrum graphs on 3000k, 3500k & 4000k.
    3000k had the less amount of blue and 4000k the most. Both companies recommended 3000k for full cycle and 4000k for veg only, they also have 2700k for blom only and some other models above 4000k but again for veg only.

    So my thinking was getting 3500k which had more blue, better for veg and the extra Cree 660nm for bloom.
    If money was not an issue then from what I understood I would have bought 2 different light setups, one perhaps 5000k+ for veg and 2700k for flower, but as it is I want to get 1 setup for both.
    Getting decent growth in veg but still put the most energy on bloom.

    So why more blue? Shouldn't 3500k being halfway between 3000-4000k be good enough for veg?
    For now I only grow autos and will most likely do that several more grows, not sure if it matters when it comes to light decision but I thought perhaps it would help you and anybody else reading this and trying to help :)
     
    TEKNIK likes this.
  4.  
    TEKNIK

    TEKNIK Well-Known Member

    You are right, the only reason to add blues is if you could control the spectrum, there is no point in doing it for a fixed spectrum.
     
    grisbi likes this.
  5.  
    TEKNIK

    TEKNIK Well-Known Member

    If they were placing blues on the boards that were not 450nm and replaced them with 420nm there would be a reason to do it. They are just 450nm blues so you would be better off not having them at all and selecting the right spectrum to begin with as it would be more efficient.
     
    coreywebster likes this.
  6.  
    Ivik

    Ivik Member

    So what does this mean? :D
    If you had to choose between the two, what would you choose?

    I'm leaning towards conf2 which has the same amount lm301b leds as for example hlg v2 boards but it also has some extra Cree 660nm leds which should make it a better option.
    Conf1 has less lm301b leds but more Cree 660nm leds, not sure changing lm301b to Cree 660nm would be better...

    I don't know what to think... do you? :)
     
  7.  
    TEKNIK

    TEKNIK Well-Known Member

    I would be going for the option with the 660nm. There is no reason to add more 450nm to a board if it does not have tuning.
     
  8.  
    TEKNIK

    TEKNIK Well-Known Member

    660nm will help in the flowering stage, it will also improve efficiency too. Adding blues is a dumb idea if they are 450nm blues, some people are just dumb and buy something because of how it looks not how it performs, you will find even some of the people that have been in here commenting alot of leds that they do not have any idea what they are actually talking about.
     
    grisbi likes this.
  9.  
    Ivik

    Ivik Member

    Thx mate!

    But I have to say that I'm not really following you (really new to leds).
    The option has never been the add more blues, Airwalker16 wrote about changing some of the reds to blues.

    My 2 options are basically what I wrote in the thread start:
    "
    Option 1: Would you guys go for more (+216) lm301b leds and only having 48 Cree 660nm but also 48 more leds in total?
    OR
    Option 2: Would you prefer having less (-216) lm301b leds but much more (+168 Cree 660nm leds and also 48 less leds in total?
    "

    And if I understood you correctly between those two it would be better to go with Option 1?
     
  10.  
    TEKNIK

    TEKNIK Well-Known Member

    I can't tell you the combination that is perfect for you. Some strains like more red in the 660nm range than others. A heavy 660nm spectrum will generally cause more stretch to occur. It's hard to look at a board and know how the spectrum is going to work also.
     
  11.  
    Ivik

    Ivik Member

    I bet it would be hard to say anything with the small amount of data provided by me :D
    I also have understood that more 660nm spectrum will often cause more stretch, but since I grow autos I don't mind stretch, perhaps stupid thinking from my part?

    I have attached a pic for Option 1, this data is 1 single board (288 lm301b AND 8 Cree 660nm), using 100w from 45cm.
    Not sure if it's any help but at least some more data to look at :)
     

    Attached Files:

  12.  
    TEKNIK

    TEKNIK Well-Known Member

    The 660nm peak in the spectrum you have shown is not all that big so it will just help with efficiency overall. Looks very similar to a fluence spectrum.
     
  13.  
    welight

    welight Well-Known Member

    To add colours to a white balanced spectrum and not be able to access and control those colours seems counter intuitive. Boards built with fixed ratios rely on knowledge from growers, most china built boards dont come with that knowledge one of the reasons we build tuneable Solskins is you control the spectrum, it might be that tuneable vs fixed ratio is a similar rabbit hole but it only seems that way, tuneable spectrum has you in control
    Cheers
    Mark
     
    SSGrower and grisbi like this.
  14.  
    Ivik

    Ivik Member

    I could actually save myself some money and buy "regular" qb288 lm301b boards instead, no added 660nm.
    If nobody actually thinks the added 660nm will help that much then why pay more for something that perhaps does not help that much?
     
  15.  
    TEKNIK

    TEKNIK Well-Known Member

    To be honest I don't think it will make much difference, you could have some CRI 90 leds in there and it would work better than having the few 660nms, would be cheaper too
     
  16.  
    TEKNIK

    TEKNIK Well-Known Member

    How many watts is that board? I'm not sure if I'm reading it wrong but efficiency looks terrible
     
  17.  
    GreeneryBob

    GreeneryBob Well-Known Member

    you could wait a week or so for the new 'R' spec boards to be released from HLG and see what they have to offer
     
    Rocket Soul likes this.
  18.  
    Ivik

    Ivik Member

    Well its more or less this one but I will have a different layout, mine will be 3 boards in a row on a heat sink and I will get 2 of those so total of 6 boards.
    And the drive for each hear sink (3 boards) will be: HLG-320H-54B

    This is 6 boards all together with a HLG-600H-54B, but the boards in mine and this are the same.
    If you scroll down a bit you will see some test data from different heights.

    Which values are you looking at to determine efficiency?

    I tried to insert link to the product but I the forum says I'm not allowed, it seems I have not received the minimum number of likes :D

    I will see if I cannot send the link to you in a PM.

    Or try to google "R2T QB288 V2+ Samsung lm301B SK full spectrum Quantum Board 600W LED Grow Light with XPE 660nm"
     
    TEKNIK likes this.
  19.  
    Ivik

    Ivik Member

  20.  
    TEKNIK

    TEKNIK Well-Known Member

    If it's another made in China board I'm sorry but I can't be bothered, there are too many of them from these small factories, I don't trust any information out of China, I deal with China on a daily basis and I don't trust the information they give out from these small factories.
     

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