Lighting MedGrower does DIY Led build (Citizen COB CLU048-1212)

[wayward1]

I've just noticed you have the b driver which means you can dim each chip down to 5w, or 10w for them both. So with 2 cobs on that driver you will have 100w on full power, dimmable all the way down to 10w

 

[BigSm0]

Hi

I recently purchased CLU048-1212C4-303M2K1 cobs and a MeanWell HLG 185H 1400B driver

My question though is, I only had funds to get 2 x 1212 COBS with passive heat sinks. Would I be able to wire / run / start these 2 cobs on the driver (without risking damaging driver / cobs) while I scratch together some more funds to complete the setup (2 x more 1212's)

Correct and perfectly fine to run them on this driver and even fine to run 1 if you needed to.

In series you divide your cobs voltage by the drivers voltage. The amperage remains the same per cob.
This driver 143v /2 so it fits and each cob will get 1.4amps which is 50w

In paralell you divide the drivers amperage by the total amperage. Since this driver had low amperage and high voltage it's more for series vs paralell.
1400ma /2 700ma

 

[wayward1]

Hang on. Now I'm confused. The driver forward voltage is between 71 and 143 which means it needs at least 2 X 36v cobs before it will work. ?

 

[ClockworkOrange]

Alright folks!

I have gotten some really good and useful consultation from, you guessed it, @BigSm0 (thank you man!!) and I have desided to go with passive cooling. I've gone and studied plenty about basics of electricity, wire colour codes and such. Ordered single thread wires, holders, wire connectors, solder station and lead free tin to solder with along with shrink tubes. Next up I am designing a frame for the light fixture. I am having a growspace of 120cm x 60cm so I want to give it a even coverage with this light. The elements are 134mm in diameter and I plan to leave each element and the powersource 50mm space for the heat to dissapate. Provided the size of the 4 heat elements and spaces, the total length of the unit would go as far as 90.4 cm leaving almost 15cm to each side of the light in the growroom.

I have written down a rough "blueprint" of the design. You can see in the middle there is the HLG-185A-C1400A and next to it there are the passive coolers. In each point of the upper line in the diagram, I am planning on running down an aluminium strip to hold each element.
View attachment 672194

Any comments, points, tips or absolute no no's?

- I guess one question I could have for you, is to how thick of aluminium I should use in the frame so it can safely hold together? I plant to use L -shaped bars on the sides so there is more support to it.

-Also, I hope that leaving 5cm space to the coolers is enough so they can operate as intented?

-Would be more ideal to have the powersource separated from the fixture?

What heatsink did u decide to use now?

 

[MedGrower]

What heatsink did u decide to use now?

Hey man! I went with ModuLED Mega 13450-HBG