4x4x7 Tent - 4x QB120 5000K @2100ma - 4 Autos - Flower Phase Questions

Hey Rollitup,

First time grower here. I have been planing to grow for months. After some research and thinking of different type of lights, I have concluded to buy QBs. However, I made a mistake of buying 4x 5000K because last week there were no 4000K versions now there are and I need some advice. Thank you.

Options:
1) Returning the 5000K boards and reordering 4000K ones. (This one is going to take a lot of time for me (intl. shipping) because I am going to have to wait for refund (spent all my money) and they can be out of stock again at that moment.

2) Supplementing with a Clu048-1212 4000K @2100ma 75w. Do you think can one single COB take the plants trough flower stage plust 4x QB120 5000K? Is it enough?

You can also use 5000°k for flowering. The plants will stay a bit shorter and bushier and it can take longer until they finished but it works for sure.
If any, I would add another two 3000°k boards later and run all boards in parallel on the same driver. Positive side effect, effiency goes up with more boards(less current per board)! Would be near 4350°k or so..
Or you add a few deepred diodes on it's own driver.
20 Cree XP-EHE in photored or Osram Oslon SSL120 in hyperred and a small 35w/700mA(Meanwell APC-35-700) would be a nice bloom switch(deep, photo and hyperred is all the same, ~660nm).
Spectrum would shift from cool- to warmwhite when switched on.

Thank you for your inputs Randomb.

How about a single CITIZEN AMBER 65 CRI LED CLU048-1212C4-22AL1K3 2200K? Will this work?

I can't seem to find anyone who ships the diodes to where I live. That is why I am asking about these specific cob leds, I'm sorry. Also, If I somehow get a hold of 3000K boards how do you think I should position them between 5000k boards?

These specific COB's contain also a lot of red, deep- and far-red (and a bit blue) and you can use them in the same way like additional deepreds. Like a bloom switch...
4 additional COB's in series and a HLG-120H-1050B would be ~155w watts, 2 COB's in parallel and an HLG-100-36A would be ~100-110w. HLG-60H-36A and 2 COB's would be ~65w. For a 4x 4' I would use ~500-550w total, maybe 600w if they can handle the light. You could dimm the 5000°k boards down to 350w and switch the HLG-120 on when switching to 12/12. That would work an depending on how much watt you add the spectrum shifts to a warmer tone.

Randomblame said:

You can also use 5000°k for flowering. The plants will stay a bit shorter and bushier and it can take longer until they finished but it works for sure.
If any, I would add another two 3000°k boards later and run all boards in parallel on the same driver. Positive side effect, effiency goes up with more boards(less current per board)! Would be near 4350°k or so..
Or you add a few deepred diodes on it's own driver.
20 Cree XP-EHE in photored or Osram Oslon SSL120 in hyperred and a small 35w/700mA(Meanwell APC-35-700) would be a nice bloom switch(deep, photo and hyperred is all the same, ~660nm).
Spectrum would shift from cool- to warmwhite when switched on.

Click to expand...

Something like these/

jarvild said:

Something like these/
View attachment 4153727 View attachment 4153729

Click to expand...

Yup, that's something similar..