B it is then, last thing I want is that dimmer stripping LOL
Luminus CXM-32 Gen3 the next big thing??
- Thread starter bassman999
- Start date
SimonBarSinister
Well-Known Member
Ok so after cramming too much info(or not enough) into my head, I shall instead appeal to the expertise of the Riu community. I have a 4x4 area that I believe I want to put 12 cobs in. Im thinking the cxm22 or citi 1818 because of budget, and i think the technology is changing fast so there's no point in spending big $s on the latest product. ( anybody remember when VCRs were $1,200 when they came out?) I have a basic understanding of the cobs and drivers but don't really know much about wiring in series or parallel or why either one is better, also dont know which( 36v 52v 72v ) would be better for my application. I'm feeling around 50 Watts for efficiency and heat reasons? Thanks in advance for your valuable time everyone !
If you use the proper size screw driver and dont over do it there is literally nothing to worry about.
I actually have one that got stripped out because I was using a smaller screw driver on it. A proper sized screw driver will still dim the stripped out one just fine.
Just sayin.
qballizhere
Well-Known Member
you wouldn't need 12 cobs for a 4x4 unless your diving them around 1.0A
if you went with 9 cobs of either 1818 or cxm and drove them at 1.4A it would give you a ppfd of 870 and at 2.1A you're at 1265 ppfd
Those numbers are from the cob calculator and for the 1818
The cob tells you what the min and max voltage as well as amperage. That is the guideline to stay in for that cob.
here this may help explain series and parallel http://www.ledsupply.com/blog/wiring-leds-correctly-series-parallel-circuits-explained/
SimonBarSinister
Well-Known Member
Thank you @qballizhere , exactly what i was looking for ! Knowledge
SimonBarSinister
Well-Known Member
So which driver combination would work best with 12 of the cxm22 for maximum ppfd @ the most efficient wattage(50-60 ?)
qballizhere
Well-Known Member
Do you want to dim the leds? then a B version is needed or do you want software dimming? then D2
I would use elg-240-54 d2 for software dimming
If you wanted pot dimming hlg-240-54-b
If you wire 2 cobs per diver it will be 2.2A each 3 cobs are 1.5A each and 4 cobs is 1.1A
licoricetree
Well-Known Member
2xhlg-320-48a or 1x600-48a work well but have to dim at driver.
SimonBarSinister
Well-Known Member
Also series or parallel? I started off thinking series but a lot of people are saying parallel and I don't think I'm qualified enough to know the pros and cons of each to make the best decision
CobKits
Well-Known Member
i use the little instrument screwdrivers and have never had a problem
licoricetree
Well-Known Member
You can put 6 on the c1050 running at 51v. so that should work in series.
CobKits
Well-Known Member
thats not how constant current drivers work. nothing would be at 58V
licoricetree
Well-Known Member
thank god someone is here to correct me. can i get the math running these on the contant current
CobKits
Well-Known Member
as long as you have half the max voltage it will work
1. look up voltage for cob at that current (at 1050 cxm22 is 51.1V)
2. look up driver voltage (119-238 for hlg240h-c1050)
1 cob in series = 51.1V = below voltage range of driver, wont light up
2 cobs in series = 102.2V = below voltage range of driver, wont light up
3 cobs in series = 153.3V = whee doggie
4 cobs in series = 204.4V = whee doggie
5 cobs in series = 255.5V =over voltage range of driver, wont light up
with either 3 or 4 cobs your cob voltage is 51.1 in any case
1. look up voltage for cob at that current (at 1050 cxm22 is 51.1V)
2. look up driver voltage (119-238 for hlg240h-c1050)
1 cob in series = 51.1V = below voltage range of driver, wont light up
2 cobs in series = 102.2V = below voltage range of driver, wont light up
3 cobs in series = 153.3V = whee doggie
4 cobs in series = 204.4V = whee doggie
5 cobs in series = 255.5V =over voltage range of driver, wont light up
with either 3 or 4 cobs your cob voltage is 51.1 in any case
licoricetree
Well-Known Member
ok i see so cxm at 1050 runs at 51v on datasheet multiply by the number of cobs and 3 to 4 will give you 153-204v being used out of 238 avalible. And lights will only come on at 119v+. Is that correct?
bassman999
Well-Known Member
open circuit voltage max 311 V
I think this means you could probably do this.
qballizhere
Well-Known Member
The hlg-320-48a would be 48v total but you divide the Amp by the cobs so if it had a output of 6A and you wanted to run 3 cobs each cob would get 48v but 2A
licoricetree
Well-Known Member
hese mean well go higher then rated. 320-48a has a max of 53v
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qballizhere
Well-Known Member
yes it can it will also work as low as 24v at 52v that is maxed out if you wanted 52v its better to get the hlg-320-54 because you also have to add in voltage drop i didnt see if the drivers were on the frames or on the wall outside the room. if you have that driver and mount it on a wall with the light being 10 feet away using 18 ga wire you will lose almost 3% so you will only have 50v at the end availible for the leds.That is before the first led and the voltage drop for the frame wiring
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