New style Samsung LM561C Board

[firsttimeARE]

View attachment 4058698

Here's a pic of a previous build.
They are going to fit fine I'm just going to need to fiddle with my placement of a few things. I've made two different 3x3 lights each with four boards so I do have some experience wiring them together.
These boards don't require heat sinks. The LEDs are spaced far enough apart and at the current I'm running it shouldn't be a problem. On my other build the boards max out at about 110F at full power. I am going to document the heat output and have some heat sink ideas if needed. Time will tell. These PCBs seem to be thicker but then again there are more LEDs on it.

Are you series or parallel? I run mine at 1050ma for 2 boards in series and saw you had 1700ma for two.

 

[Corso312]

If I was to do this again I might use some steel bars or something to firm it up. It's kinda floppy.

You could add 4 stiffeners of angle iron to tighter her up.

 

[tomate]

@chuckduck
Could you please make a macro shot of one diode?

 

[chuckduck]

@chuckduck
Could you please make a macro shot of one diode?

 

[chuckduck]

i would remote drive them, have the drivers mounted on a plywood board or the wall or something. i have a hard time believing no heatsink needed. my quantum boards are 120v @ 1400ma and they run at 75* celsius with heatsink

So just out of curiosity I turned off all my fans and turned up the pot to 100% and left it there an hour. These are running at 2100mA.
I turned on the fan pulling heat from the top of the tent. Air comes in a cracked zipper at the bottom. I'll post a new temp reading in a bit.
These boards are running 82 watts each. Math suggested they would have run 75 watts. 36v*2.1=75 The new boards have a higher voltage and more diodes so will pull more watts. The PCB seems thicker. Ultimately, I won't know if I need heatsinks until I get it up and running and do some tests in my environment (tent). Not running with a heatsink really cuts the cost. Though, I do have an idea for a cheap heatsink.
So far costs are:
Boards - $360
Aluminum angle - $45
Drivers - $208
Cords - $12
Universal wire connector - $20
Have far red initiators coming but, obviously, those aren't needed.
So $645 in for a 938 watt LED. Remains to be seen the footprint that this will cover. I'll keep this updated.

Edit: After turned on the fan and sucking out the top the boards have stabilized at 104F.

 

[chuckduck]

Redid everything this morning. Looks much better and screwing things down firmed things up a bit. Using thicker aluminum angle would have helped things too. Appreciate the suggestions. I'm sure others who may attempt a build do too.

 

[chuckduck]

Ran back downstairs and decided to take a light reading on the the four board Photon Fantom 3500k Sunboard setup running at 2100mA. I was using the Hydrofarm Quantum meter and now realize, after reading the forums more in depth, it's a pretty shitty meter. So take this for what it's worth. At 12 inches I'm getting 500-550 PPFD. At 24 inches I get 250-300 PPFD. The trade off for more coverage and diodes spaced farther apart is a loss of intensity.
Is there a consensus on PPFD for vegging at 24 hours/day.

FYI, emailed The Guy and he said these are available in 90 CRI. Have an email in to see at what K they are available.

 

[linderstein]

Ran back downstairs and decided to take a light reading on the the four board Photon Fantom 3500k Sunboard setup running at 2100mA. I was using the Hydrofarm Quantum meter and now realize, after reading the forums more in depth, it's a pretty shitty meter. So take this for what it's worth. At 12 inches I'm getting 500-550 PPFD. At 24 inches I get 250-300 PPFD. The trade off for more coverage and diodes spaced farther apart is a loss of intensity.
Is there a consensus on PPFD for vegging at 24 hours/day.

FYI, emailed The Guy and he said these are available in 90 CRI. Have an email in to see at what K they are available.

it makes up for that they can be 5 cm away from the apicals

 

[Sour Wreck]

nice build

 

[VegasWinner]

Do any diodes produce 90CRI?

Is there a noticeable difference between 80cri and 90cri, in terms of yield or bud density?

There are 90cri available.

 

[VegasWinner]

To answer a few questions. These are 80 CRI and I got the 3500K boards. I started putting the frame together and things were going well to start.
View attachment 4058639

Off to a good start. Decided to put the boards around the outside as a ring as suggested. Driver placement was a little tricky but I think I found a good way to keep things evenly balanced.View attachment 4058640
Had the boards facing this way just to get an idea of the layout. When I flipped the boards things started to get a little tight and you'll see my problem in the pictures.
View attachment 4058641
Things worked well when the boards were oriented one way but not so well the other. The connectors aren't going to fit. My last post in this forum was called "Watch a moron build a LED light" so this is to be expected. No surprise here. I'm going to walk away from this for the evening and flip some things around in the morning. I still have to wait for cords, connectors and a few other odds and ends. I hope to have everything mounted and wired up tomorrow.

Use some plastic standoffs with longer screws for clearance maybe 3/4"

 

[chuckduck]

Use some plastic standoffs with longer screws for clearance maybe 3/4"

Good to go. Just had to move some things around. RapidLED order is due to arrive today. Hoping to finish this tomorrow if I can get away with ignoring my wife for a while. We'll see how that goes.

 

[legalcanada]

LM561C are available in 70, 80, and 90 CRI. (2700k) 3000k, 3500k, 4000k, 5000k (5700k) (6500k)
spectrums in parenthesis not available for 70 CRI

i imagine the factory has access to all the diodes

http://www.samsung.com/global/business/led/products/led-component/mid-power/lm561c
here is the list including luminous flux for each spectrum for each CRI - the data sheet PDFs include a lot more information for each including specs by bin

 

[see4]

There are 90cri available.

I've been looking around and it seems only COBs are up to 90cri, haven't seen small diodes with 90cri, but i probably haven't looked hard enough.. will keep looking.

 

[see4]

LM561C are available in 70, 80, and 90 CRI. (2700k) 3000k, 3500k, 4000k, 5000k (5700k) (6500k)
spectrums in parenthesis only available for 80 and 90 CRI

i imagine the factory has access to all the diodes

http://www.samsung.com/global/business/led/products/led-component/mid-power/lm561c
here is the list including luminous flux for each spectrum for each CRI - the data sheet PDFs include a lot more information for each including specs by bin

Ahhh! That's why I haven't found any 90cri diodes... because its only available in the spectrums I don't use... lé sigh...

 

[see4]

So just out of curiosity I turned off all my fans and turned up the pot to 100% and left it there an hour. These are running at 2100mA.
View attachment 4058819 View attachment 4058821 I turned on the fan pulling heat from the top of the tent. Air comes in a cracked zipper at the bottom. I'll post a new temp reading in a bit.
These boards are running 82 watts each. Math suggested they would have run 75 watts. 36v*2.1=75 The new boards have a higher voltage and more diodes so will pull more watts. The PCB seems thicker. Ultimately, I won't know if I need heatsinks until I get it up and running and do some tests in my environment (tent). Not running with a heatsink really cuts the cost. Though, I do have an idea for a cheap heatsink.
So far costs are:
Boards - $360
Aluminum angle - $45
Drivers - $208
Cords - $12
Universal wire connector - $20
Have far red initiators coming but, obviously, those aren't needed.
So $645 in for a 938 watt LED. Remains to be seen the footprint that this will cover. I'll keep this updated.

Edit: After turned on the fan and sucking out the top the boards have stabilized at 104F.

Frickin awesome man!

 

[legalcanada]

Ahhh! That's why I haven't found any 90cri diodes... because its only available in the spectrums I don't use... lé sigh...

no 90cri is available in all those spectrums. i meant the ones in paranthesis are NOT available in 70 CRI. all spectrums available for 80 and 90 though.

 

[Humple]

LM561C are available in 70, 80, and 90 CRI. (2700k) 3000k, 3500k, 4000k, 5000k (5700k) (6500k)
spectrums in parenthesis only available for 80 and 90 CRI

i imagine the factory has access to all the diodes

http://www.samsung.com/global/business/led/products/led-component/mid-power/lm561c
here is the list including luminous flux for each spectrum for each CRI - the data sheet PDFs include a lot more information for each including specs by bin

So there are 90 CRI LM561Cs? Makes me wonder why HLG used Nichia diodes for their prototype 90 CRI QB288.

 

[see4]

no 90cri is available in all those spectrums. i meant the ones in paranthesis are NOT available in 70 CRI. all spectrums available for 80 and 90 though.

Oh! My mistake, I misread that. Well, I'm getting the 80CRI diodes from what the packaging says. I can live with that for $30 a board.

 

[legalcanada]

So there are 90 CRI LM561Cs? Makes me wonder why HLG used Nichia diodes for their prototype 90 CRI QB288.

it's probably due maybe to binning, price, or efficiency. might also not be available thru their supplier. here is the samsung list for the 90 CRI spectrums and their luminous flux @ 65ma. first column is bin, 2nd is minimum lumens, 3rd is maximum lumens.

LM561C 80CRI goes up to S6 bin, you'll notice 90cri is only s2 or s3 max. not sure if that means anything.