Trying to figure out how to use ldd type drivers

So I've got a diy rig that's got around 35v spare it's a 1400 ma driver and I'm wanting to use up this extra space on the driver with some supplemental 660nm, I've got 10 cree xme 660nm photo reds highest bin available, and I am thinking I can run some in parallel on this driver,

the cobs currently on the driver are in series already, so would I add a tripple wago to the positive and negative on dc side where the wires plug into the cobs and run a series circuit , or would I plug a ldd driver that has a output voltage of 25v + with a constant current of 700ma ,

Sorry if this sounds stupid but I'm not the best at this stuff lol.


What I wanna know is oif i use a ldd driver in parallel off the led positive and negative wires via a wago or something would I need to still run parallel of the ldd driver ?

TL;DR .. Driver is a 250w 1400ma 179vdc , currently 4 cxb 3590 on it so there is about 35vdc left to spare. HOW CAN I ADD 10 XPE PHOTO REDS ONTO THIS DRIVER TO MAX IT OUT??

@CobKits , @ rahz , @ welight
, @ all you wonderful ppl here at riu thanks for all your help

Okay so I think I have sorted this out but am wanted some advice before I try this lol.

I'm thinking add a triple Wago to my wires on the dc output side of the driver that goes into the cobs.

Coming out of those triple wagos ill have positive and negative going to the cobs to create my series circuit on the cobs.

The spare wago input that I'm left with Will have the positive and negative wires from my dc-dc buck driver.

Then create a series circuit from the buck driver to the 10 deep red leds, will this work or will doing this reduce the main driver to run at lower power/current?

Would I need to maybe put this dc-dc buck in between the last cob in series and the main driver and then add my deep reds into the series lol?

MADE UP A SMALL SCHEMATIC OF WHAT IM THINKING MIGHT WORK? I KNOW ITS REALLY MESSY BUT WILL THIS WORK, WHILE LEAVING MY ORIGINAL COBS RUNNING AT 1400 MA ? OR SINCE IM NOW ADDING ANOTHER SERIES CIRCUIT IN PARALLEL WITH THE COBS WOULD IT CHANGE THE CURRENT OF MY COBS TO 700MA?

Number 1: You should not be 'Maxxing' out your driver as 80-90% of max is usual limit point (opinion not fact).
Number 2: Placing the LDD in parallel would feed the 107v minimum to LDD (they have 56v max input).

Don't think I've seen supplemental lighting added to an HGL driver in that way.
Even @Growmau5 used a separate power supply for his LDD mono LEDs.
LRS-150-xx runs about $20

Couple of points
you cant run LDD/Cutter drivers from a CC driver, they are CC in themselves, you need a CV source, depending on the load/Volt capacity of the led driver you would be better to just tap of the CC driver, and do a parallel with that that tap. Most drivers can never be maxed out as they need a couple of volts at least for internal house keeping, so keep that in your calculations. The only down fall with all this is the Monos will be on the same cycle as the COBS, if you need to control separately would definitely drop $20 on an LRS and the get a LDD/Cutter driver, that way they can be controlled as required, if thats what you need
Cheers
Mark

welight said:

Couple of points
you cant run LDD/Cutter drivers from a CC driver, they are CC in themselves, you need a CV source, depending on the load/Volt capacity of the led driver you would be better to just tap of the CC driver, and do a parallel with that that tap. Most drivers can never be maxed out as they need a couple of volts at least for internal house keeping, so keep that in your calculations. The only down fall with all this is the Monos will be on the same cycle as the COBS, if you need to control separately would definitely drop $20 on an LRS and the get a LDD/Cutter driver, that way they can be controlled as required, if thats what you need
Cheers
Mark

Click to expand...

Thanks Mark!! So if I was going to tap straight into the CC driver with the monos, would I just run them in series with the cobs without the dc-dc driver?

HalfBee said:

Number 1: You should not be 'Maxxing' out your driver as 80-90% of max is usual limit point (opinion not fact).
Number 2: Placing the LDD in parallel would feed the 107v minimum to LDD (they have 56v max input).

Don't think I've seen supplemental lighting added to an HGL driver in that way.
Even @Growmau5 used a separate power supply for his LDD mono LEDs.
LRS-150-xx runs about $20

Click to expand...

Would the lrs-150-24 be enough for 10 xp e running at 700ma, they draw about 16.1 watts and 23v added up in the string, or 1.61w each at 2.3v and 700ma.

johnsmithusername said:

Would the lrs-150-24 be enough for 10 xp e running at 700ma, they draw about 16.1 watts and 23v added up in the string, or 1.61w each at 2.3v and 700ma.

Click to expand...

No, the LDD has a 3 volt drop from input voltage so 24 volts in would give 21 volts out, but 36 volts in would give 23 volts out (or whatever the LEDs draw at 700mA current X number of in string). The bucks will bring voltage down to match 700mA draw, but can't increase output above input voltage minus 3 volts.

The LRS-150-24 can be adjusted (21.6 ~ 28.8V) but that's a decision I won't make for you. It is possible, but not within spec...

HalfBee said:

No, the LDD has a 3 volt drop from input voltage so 24 volts in would give 21 volts out, but 36 volts in would give 23 volts out (or whatever the LEDs draw at 700mA current X number of in string). The bucks will bring voltage down to match 700mA draw, but can't increase output above input voltage minus 3 volts.

The LRS-150-24 can be adjusted (21.6 ~ 28.8V) but that's a decision I won't make for you. It is possible, but not within spec...

Click to expand...

Okay thank you you've been very helpful!!

do you know where I can possibly find a lrs-150-36? For 20$?

Yep... Jameco they have them for $20.20...
There are also 75 and 100 versions it's a whole line of meanwell power supplies that replaced the old RS line.

HalfBee said:

Yep... Jameco they have them for $20.20...
There are also 75 and 100 versions it's a whole line of meanwell power supplies that replaced the old RS line.

Click to expand...

Okay thank you! I've just had a look on ebay and have found a apc-16-700 for 25$ with free shipping, it says it puts out 16.8w with 9-24vdc @700ma, pretty sure that's going to work with these without needing a dc-dc driver.

Or for 30$ free shipping I could get a lpc-35-700 wich puts out 33.6w and 9-48vdc with 700ma

Both constant current drivers

Oh these seem like a steal 5x 18w drivers only 85% efficiency but only 35$ delivered and I can use the other 4 for other projects, will these work for 10 x 660nm deep reds at 2.3v each and 1.61 watts each

johnsmithusername said:

Thanks Mark!! So if I was going to tap straight into the CC driver with the monos, would I just run them in series with the cobs without the dc-dc driver?

Click to expand...

yes you can do that, but bear in mind the 1400ma, which will be over the Red drive spec, so the parallel off the the 1400ma to give you 700ma (divide by 2) is your safest solution, only other consideration as mentioned is what is left in voltage once you have configured your cobs
Cheers
Mark