Series / Parallel Risk / Reward EB strips

[Popl111]

Correct me if im wrong but I could run 20 bxeb-l0280z-35e1000-c-b3 on a HLG-120H-C700A at the recommended 350mA if I ran 2 parralell circuits of 10 in series right? Please help

Yes, you are correct... But at 195 Vf its well over the Bridgelux Gen2 rated LED strip Working Voltage of 60 Vdc

So this guy said
"I learned that this limit is theoretical." So if i hooked them up like that is it theoretical falure or would it work just with a higher potential of falure in bad conditions? Or would it just not work at all?

[PeteR_1]

So this guy said
"I learned that this limit is theoretical." So if i hooked them up like that is it theoretical falure or would it work just with a higher potential of falure in bad conditions? Or would it just not work at all?

There are several (lots, too many IMO) of examples of “working” LED Strip Lights with 200 - 300 Vdc wired circuits, but it’s done using “Circular Reasoning”. Just because it can be done doesn’t mean that it should, the Electrical Rating are there for safety reasons.

[Popl111]

Right i understand and I am very thankful for your input and advice I have a lot to learn still I'm just wondering what the potential risks and reasons for them and what is the probability of falure in running like this because I already have the driver I got it before I really understood how i wanted to wire and was first inteded to run cobs but now im learning strips and qb's are around 10% higher in eficentcy give or take on how they are ran I guess

[Horst]

@Popl111

Just wanted to show u second opinion. It’s funny somehow. In this Forum nearly everybody arguments for parallel. I read in another firing too, there everybody tells u ur led go to hell with parallel if ur temperature is not the same for every single one....
Both sides have their points and it’s Hard to rate the risks for myself too. My tendency is to do seriell and stay below 200v. U can always take two 120 instead of one 240 for example to make the whole thing smaller.
I respect this thing and install everything calm and carefully. I have good airflow too so it’s Never „wet“ in the room. And high ampere has its dangers to.....it’s a little dangerous no matter if parallel or serious when dealing with electricity.
Read many different opinions and build ur own. At the end it’s always ur own responsibility to decide.

Greets

[PeteR_1]

@Popl111

Just wanted to show u second opinion. It’s funny somehow. In this Forum nearly everybody arguments for parallel. I read in another firing too, there everybody tells u ur led go to hell with parallel if ur temperature is not the same for every single one....
Both sides have their points and it’s Hard to rate the risks for myself too. My tendency is to do seriell and stay below 200v. U can always take two 120 instead of one 240 for example to make the whole thing smaller.
I respect this thing and install everything calm and carefully. I have good airflow too so it’s Never „wet“ in the room. And high ampere has its dangers to.....it’s a little dangerous no matter if parallel or serious when dealing with electricity.
Read many different opinions and build ur own. At the end it’s always ur own responsibility to decide.

Greets

I haven’t built any high power COB fixtures but the “Other” Series / Parallel discussions may be an “holdover” from them. COBs often need Series wiring due to current / amperage requirements and higher operating voltage. LED strips are built a little different with different ratings.

[Popl111]

Right i see both sides but if it has been done with great succession and doing what you can to reduce possible risk factors like heat wiring moisture etc so in optimal conditions what would the chances of mechanical falure or worse by exceeding that 60v around the range that im running around 200v also does it reduces risks running at 350mah also is there anything else I can do to protect it and one more thing lol i want to run a ir cob in the middle its 30w 20-22v and can run at 1a I found a plug in adaptor ill show a pic but it should run that single cob right I know i will have to cut and solder yhe wires and all

[Welight]

Why will a constant voltage driver adjust its voltage down to 39? Is it only because there’s 10 strips and that will max out the current output and not allow it to reach 42 volts?

They do this because they're designed to do it as part of being a LED driver. There's circuitry that monitors the output and adjusts the voltage to match what the LEDs want. The voltage the LED want is determined by the current.
If you were to run one strip, yes it would fry but not because of the voltage, just the excess heat generated by the excess current.

What you describe here is Constant current control, this does no apply to Constant Voltage drivers unless you get an A or AB or constant power version, but not a B version

[Shimbob]

I don't think I have the parts to play with this, but if I had, say, a cxb3590 36V cob, and I wired it to a, say HLG-40h-36B, and measure the output voltage, would it be 36V, or reduced to what the COB runs at, ~33V-ish? (I don't know exactly what voltage it would would be since the Cree PCT doesn't go that low)

[Horst]

Thanks fir the calm and mature discussion guys. What i are wondering about, high voltage has its risks and high ampere too.
With high voltage u got a little higher risk to get a
But with high ampere a U would have more damage if it happen.
But very difficult to weight one against another.

But I have one question for the pro‘s.
The bxeb strips have a 60v dc limit. I read this too. But why? I read a discussion from very experienced guys with knowledge about Samsung strips with measuring, numbers porn and testing... Conclusion was that the limit of the pcb‘s is 2000v dc cause of the connectors. There are guys going over it and that’s insane and crazy for me

Are there such differences in pcb‘s or is blx just super careful? I didn’t find such an 60v dc limit nowhere else in datasheets.

Greets

[R^2]

This is interesting though. Has anybody had any issues on running the strips higher than what the strips DC limit suggests. For my setup they are running at ~103-108V. I wonder if I will have issues later on or possibly shorten the lifespan of the strips. I sure hope not. Peter is giving good information. I had studied the datasheet for my strips quite a while and for whatever reason I didn't even notice this note that defines maximum DC limit through the PCB. In my opinion Bridgelux should include this information a bit better, preferably same place where other maximum ratings are placed.