DIY with Quantum Boards

[JustMeds]

Does anyone see a problem with the thermostat wire?

 

[Schalalala]

Latest boards were all same voltage bin 561C

AZ or A1?

 

[robincnn]

AZ or A1?

AZ

Does anyone see a problem with the thermostat wire?

Not sure what's voltage rating on that
I use NTE
https://www.ntepartsdirect.com/ENG/CATEGORY/HOOK_UP_WIRE_300_VOLT_SOLID
https://horticulturelightinggroup.com/pages/qb-optics-and-connectors

 

[robincnn]

Dimming Type A Driver

Vo needs adjustment only if LED/Board/COB Voltage exceeds 54V
For Qb288 boards, most cases you don't need to adjust it
https://horticulturelightinggroup.com/pages/qb288-board-guide


Io (current) for dimming

 

[robincnn]

Test Board QB144 with 144 diodes
Half populated Qb288

 

[robincnn]

Kits extras.

 

[robincnn]

Acrylic sheet

 

[CobKits]

Does anyone see a problem with the thermostat wire?

it should be fine. is probably marked CMR/CLR2 which is a 300V rating

 

[robincnn]

Got a acrylic sheet from Lowes and cover. Right bare diodes.
135W kit








More pics of sheet
https://www.rollitup.org/t/diy-with-quantum-boards.927159/page-115#post-13377349

 

[robincnn]

260Kit
+ of 1st board facing - of other board can make wiring easier

 

[robincnn]

Hope these pics help

 

[Evil-Mobo]

@robincnn how much more does the Slate heat sinks dissipate heat vs the Aluminum sheet? Have you guys measure this yet just curious?

 

[robincnn]

@robincnn how much more does the Slate heat sinks dissipate heat vs the Aluminum sheet? Have you guys measure this yet just curious?

Yes Steve and I have done several tests with plates.
Depends on heatsink/plate type, size, sheet thickness and AL grade
Slate 1 does not offer much advantage. Just a different grade of aluminum.
Slate 2 has lot more surface area than a sheet and offers better cooling than plate

 

[kcir916]

does the acrylic act as optics? or just to prevent plant tip burning

 

[Evil-Mobo]

Yes Steve and I have done several tests with plates.
Depends on heatsink/plate type, size, sheet thickness and AL grade
Slate 1 does not offer much advantage. Just a different grade of aluminum.
Slate 2 has lot more surface area than a sheet and offers better cooling than plate

Gonna send a PM have a couple of questions..........

 

[robincnn]

does the acrylic act as optics? or just to prevent plant tip burning

Does not act as optic.
Noting to do with plant tip burning

Just to cover diodes. It's not air tight . Just additional physical protection against dust, impact on diode. May also help keep some water/splay stay from diodes

 

[RandomHero8913]

Looks great Robin

 

[CobKits]

hey robin have you done any PAR readings with and without the acrylic? it has excellent transmittance on axis but im wondering how it works with such a spread out light source?

looking at the datasheet for lm561:



then the transmittance graph for acrylic:



it looks like about 25% of the light is cast off at above 50 degrees where it would start to reflect off the acrylic. so this would bounce around between the acrylic and the white board

I'd guess the losses might be closer to 10% than the theoretical 8%

 

[JustMeds]

@Stephenj37826 or @robincnn,

How do I wire my boards like you were talking about in this post https://www.rollitup.org/t/diy-with-quantum-boards.927159/page-156#post-13451698 ? Just want to make sure I do it right and not let the smoke out, its impossible to get back in....LOL Its the 480

 

[Stephenj37826]

@Stephenj37826 or @robincnn,

How do I wire my boards like you were talking about in this post https://www.rollitup.org/t/diy-with-quantum-boards.927159/page-156#post-13451698 ? Just want to make sure I do it right and not let the smoke out, its impossible to get back in....LOL Its the 480

288 or 304 boards?