Quantum Board QB 288 V2

robincnn

robincnn

Well-Known Member
Old QB 288V1 thread here
Thanks to everyone who supported original Horticulture Lighting Group QB 288 and QB 304. V2 was have possible only from your support.

What is difference between Quantum Board
QB 288 V2 and QB 288 V1

QB 288 V1 uses LM561C , 5630 package
QB 288 V2 uses LM301B , 3030 package


561C



301B



Comparing system efficiency on HLG 550 gives a good idea about performance again.

Samsung Tool Model for HLG 550
95% assumed electrical efficiency for driver, power cord.
98% assumed electrical efficiency for board. No board is 100% efficient there are losses in traces and may be due to uneven current distribution. Samsung mentioned around 4%-5% board losses.


QB 288 V2 has a lower voltage bin and is able to give a higher output with less watts.

Lab reports

HLG 550 V1 Lumens Report
HLG 550 V1 PPF Report

HLG 550 V2 Report



Wattage is lower as the new boards have lower forward voltage and are running cooler.
QB 288 V2 3000K at 2100mA was 50.8 VDC
QB 288 V2 4000K at 2100mA was 51.8 VDC

Spectrum differences

Blue is QB 288 V2 3000K
Orange is QB 288 V1 3000K



QB 288 V2 has High Reflectivity Solder mask for a better system efficiency





QB 288 V2 is the first DIY board with 301B and made by Samsung exclusively for Horticulture Lighting Group.
Latest bins for Flux and Voltage will go in QB 288 V2 first and then released as an order-able part number.


 
Prawn Connery

Prawn Connery

Well-Known Member
I asked this in another thread, but no-one has yet answered. Are the QB324 boards limited by heat production?

I note on your website that they are max rated to 250w (by my calculation, the max rating of 324x Nichia 757 6V leds is about 428w), while they are downrated to 160w when used with a Slate 2 heatsink.

My question is, what do you need to run them at 250w? Bigger heatsink? Active (fanned) cooling?

If the 324s can be run a lot harder than the 288s for only a few $ more, then they would appear to be good value.
 
Randomblame

Randomblame

Well-Known Member
KonopCh said:
If I see right, HLG550 with 4 boards is only 60x50cm? Too bad it's not larger to get even more spread in 120x120cm tent.
Click to expand...
You could split the plate and screw it on a larger frame to suit your needs. But you're right, the only thing I would change in the design would be 4 slates and a frame instead of a 600x 500mm board. Would eliminate the center hotspot and allow slightly lower distance without getting light stress.
But I think, in consultation with Steven, you can certainly swap the plate and get 4 slate's instead. Maybe they cost a little more, but for sure it's not impossible?
 
Randomblame

Randomblame

Well-Known Member
Prawn Connery said:
I asked this in another thread, but no-one has yet answered. Are the QB324 boards limited by heat production?

I note on your website that they are max rated to 250w (by my calculation, the max rating of 324x Nichia 757 6V leds is about 428w), while they are downrated to 160w when used with a Slate 2 heatsink.

My question is, what do you need to run them at 250w? Bigger heatsink? Active (fanned) cooling?

If the 324s can be run a lot harder than the 288s for only a few $ more, then they would appear to be good value.
Click to expand...

Probably only a slightly blowing fan. Active cooling improves cooling capabillities by factor 3. The 160w rating is for passive cooling.
 
KonopCh

KonopCh

Well-Known Member
Randomblame said:
You could split the plate and screw it on a larger frame to suit your needs. But you're right, the only thing I would change in the design would be 4 slates and a frame instead of a 600x 500mm board. Would eliminate the center hotspot and allow slightly lower distance without getting light stress.
But I think, in consultation with Steven, you can certainly swap the plate and get 4 slate's instead. Maybe they cost a little more, but for sure it's not impossible?
Click to expand...
Still better coverage with 1120mm strips then. Under the boards there will be too much light, and on the sides way less.
They must make 50x50cm boards in future and space those diodes on them. So future "HLG 550" would be 100x100cm instead of 60x50cm.
 
Randomblame

Randomblame

Well-Known Member
Do not forget, this is not a DIY light and not everyone wants to grow with the shortest possible canopy distance.
With 4 boards well spreaded over a 4x 4' you could get a pretty even coverage with no hotspots @ 16 and 24".

@welight has made a PAR map with 4 of his solskin boards (similar layout) and his numbers prove that.
 
robincnn

robincnn

Well-Known Member
Prawn Connery said:
I asked this in another thread, but no-one has yet answered. Are the QB324 boards limited by heat production?
I note on your website that they are max rated to 250w (by my calculation, the max rating of 324x Nichia 757 6V leds is about 428w), while they are downrated to 160w when used with a Slate 2 heatsink.
My question is, what do you need to run them at 250w? Bigger heatsink? Active (fanned) cooling?
If the 324s can be run a lot harder than the 288s for only a few $ more, then they would appear to be good value.
Click to expand...
Ye, after 200Watts , i recommend thermal paste. it will work fine even at 350 watts per board. just need better active cooling and thermal paste
 
Prawn Connery

Prawn Connery

Well-Known Member
Good stuff. I note the driver mounted directly to the heat sink. I run all my boards on remote drivers - they do get hot, as you know - so I'm guessing 2x 324s on a remote HLG-320 driver maxed out (370w, or 185w each) shouldn't be an issue with passive cooling. Thanks.
 
Aolelon

Aolelon

Well-Known Member
Randomblame said:
You could split the plate and screw it on a larger frame to suit your needs. But you're right, the only thing I would change in the design would be 4 slates and a frame instead of a 600x 500mm board. Would eliminate the center hotspot and allow slightly lower distance without getting light stress.
But I think, in consultation with Steven, you can certainly swap the plate and get 4 slate's instead. Maybe they cost a little more, but for sure it's not impossible?
Click to expand...
Pretty sure the HLG Elite is like this, it's on a frame and on movers so you can adjust it. But no telling if or when that will be released.
 
CobKits

CobKits

Well-Known Member
robincnn said:
Ye, after 200Watts , i recommend thermal paste. it will work fine even at 350 watts per board. just need better active cooling and thermal paste
Click to expand...
remember that study that peanut butter and chocolate and dozens of other things were just as good as the $2/gram thermal paste?

need some low cost options for high surface area parts. something common, nonbiodegradable, and and dirt cheap like wheel bearing grease
 
Prawn Connery

Prawn Connery

Well-Known Member
robincnn said:
@Prawn Connery
QB324 PPFD Charts added on website
https://horticulturelightinggroup.com/products/320w-xl-qb324-led-kit

QB324 Lab test reports here
https://horticulturelightinggroup.com/collections/quantum-boards/products/qb324-with-slate-2-single-combo
Click to expand...
OK, one more question:

Given the 324s are that much more powerful than the 288 V2s for the same cost ($189 for 2, including heatsinks), why would I go with the 288s over the 324s?

At this stage, I'm looking at either another Samsung F-Series strip build (6 x 2' double-row 3000K in parallel with a 320 or 480 CV driver), or 2x QB324s in series driven by a HLG-480H-C2100A (probably dialled down to about 400w).

Space is an open 3'x3' purely for flowering (actually two spaces, so I'd need two strip builds or 4x QBs).

I like the look of the 324 spectrum and I also like the fact they can be cranked up with proper cooling. They'll be in an aircon room with some active (fan) cooling, so heat shouldn't be an issue.

Thanks
 
Randomblame

Randomblame

Well-Known Member
Prawn Connery said:
OK, one more question:

Given the 324s are that much more powerful than the 288 V2s for the same cost ($189 for 2, including heatsinks), why would I go with the 288s over the 324s?

At this stage, I'm looking at either another Samsung F-Series strip build (6 x 2' double-row 3000K in parallel with a 320 or 480 CV driver), or 2x QB324s in series driven by a HLG-480H-C2100A (probably dialled down to about 400w).

Space is an open 3'x3' purely for flowering (actually two spaces, so I'd need two strip builds or 4x QBs).

I like the look of the 324 spectrum and I also like the fact they can be cranked up with proper cooling. They'll be in an aircon room with some active (fan) cooling, so heat shouldn't be an issue.

Thanks
Click to expand...

Because of the increased effiency!
With active cooling I'm pretty sure also the 288v2 can be driven at 200w(3,6A) and you would still see lower temps on the v2 side, maybe higher brightness too.
The LM301b has a better thermal management/lower thermal resistance and that compensate the slightly smaller boards and number of diodes, if they are smaller at all.
When they are the same size, then anyway!

BTW, ledgarderner has tried to blow up a single QBv1 with an HLG-600 and a step-up converter...
In short, impossible!
Temps reached over 90°Celsius at +9A!! but it works and works and is still working.
In the end he destroyed the step-up converter, but the board had no visible damage. And he did not use a fan, only the board and a Slate 2.
 
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