Switch is on the positive wire or negative?DQ no: 5
hmmm, two cobs running off a driver.. no worries. So then I put a switch on one and instead of switching off it still glowsoff but glowing! No drama like, but is that ok, glowing (in wondering)? Maybe the switch isn't good enuff...
Thanks for the suggestion smokey.
IMO don't use the PLM 40. Lousy efficiency and your right on the edge with the 12 volts for 4 XM-L2s, use at least 5 XM-L2s with that one but again not one of MeanWells better drivers.
OK I'm a little fuzzy with what you're doing. Are you trying to run the COBs in constant voltage mode? Is the driver a constant voltage driver? If not the driver you want to use doesn't have enough voltage for 2 Vero 18s. Also you don't need resistors. And no the COB will not handle extra currently that easily. If you really want to use that driver you'll need a boost driver wired in there. Actually I've read your question like 5 times and I get more screwed up the more I read it. Sorry.
Thank you, 100k ohm pot + 10k ohm resistor 1/4w+ will be fine.
29.5 I(total of current). 34-29.5=4.5/1500ma or 1.5= 3k resistor.
Thank you for your help and passing on knowledge.Sorry Im a Noob at this. I was really into some Colorado Grape Ape 2012 when I asked the question. The driver is constant current driver.
Driving power: 50w
Model: 10 series 5 in parallel
Input Voltage: 85V~265V
Output Voltage: 32-34V
Current:1750mA
Efficiency > 88%
Power Factor >0.98
Operating Temperature: -20~80
Size (L * W * H): 110mm * 32mm * 23 mm
It is a cheap o EBAY.
I wanted to run two of them in parallel. I was under the impression in series it would stack the voltage and in parallel it stacks the current. I thought running them in parallel with a 3k resistor one each lead to the Vero. The R=V1-V2/I. R= resistor needed=V1(power supply voltage) 34-V2(forward voltage of Vero 1
Less heat from each COB and one driver to two COBs and being able to run both at high amps and lower around 750ma to 800ma.
So that is what i was thunking.
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http://www.bridgelux.com/wp-content/uploads/2013/10/AN32-Vero-Series-Electrical-Drive-Considerations.pdf
View attachment 3258197
Have you read this pdf? I know picograv runs his Vero 29s in parallel and maybe what you want to do can be done but why bother when you can just get drivers that are better suited. IDK maybe I'm getting old
Thank you, I have read the part were it is a bad idea due to hogging and runaways from diffences in vf of the Cobs. I see alot of Members refer to Mr Flux and his parallel string of cobs. I have looked high not low yet for the thread and have not found it. I think my thinking is off. That the resistor has to match the diffence of the vf of the high of the two. Then It cant run,hog or become V Obese.
The other option is pontentiometer.
Age always reminds of What my father would say "Pay attention and your old age will bring you wisdom" I know he borrowed that little gem from some were.
In the driver or COB? I would think the driver would be the same, but i do believe you are correct in the loss of efficiency on the Vero 18, but that will be regained in HVAC savings.
this will work...and get the right resistor... the loss here is about 1 Watt...example in the picI wanted to run two of them in parallel. I was under the impression in series it would stack the voltage and in parallel it stacks the current. I thought running them in parallel with a 3k resistor one each lead to the Vero. The R=V1-V2/I. R= resistor needed=V1(power supply voltage) 34-V2(forward voltage of Vero 1
Less heat from each COB and one driver to two COBs and being able to run both at high amps and lower around 750ma to 800ma.
So that is what i was thunking.
