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Old 08-24-2013, 03:50 PM   #1
Mcg177
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led help


I am looking to run 4 10watt led chips over my 46 bow front. I have three running now with individual drivers, I'm looking for a driver that can run all four in series or parallel. I'm just not sure what kind of specs I need for the driver.
The led chips are the cheap eBay ones.
Forward Voltage 9-12v
Forward current 900ma
Color temp 10000k,

Now I know I should use Cree or bridgelux but I have these on hand.

Thanks for the help guys!
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Old 08-24-2013, 03:59 PM   #2
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Ive had the meanwell running my 4 ebay 10w for about a year now

http://www.rapidled.com/mean-well-el...mmable-driver/
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Old 08-24-2013, 09:17 PM   #3
Mcg177
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Did you wire them in series or parallel? And did you have to use any resistors?

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Old 08-24-2013, 10:16 PM   #4
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In series. No resistors. A 10v wallwart and a 10k pot for the dimmer
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Old 08-24-2013, 10:33 PM   #5
Mcg177
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Thank you!

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Old 09-02-2013, 02:27 PM   #6
Gamezawy
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i used a PC power supply to run a 4 of your ledsa those chines leds and they are working good but i am connecting them in parallel
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Old 09-04-2013, 11:43 PM   #7
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I have plenty of pc power supplies laying around how did you do it? I would love to do it that way as it wouldn't cost me anything

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Old 09-05-2013, 12:14 AM   #8
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An example using a meanwell LDD-1000

4 emitters
a set of 2 wired in series - 24v
both sets of 2 wired in parallel - 24v
max current - 500ma

4x of those wired in series for all 4 is 48v fv. While an LDD can handle that you will need a power supply that can do at least 52v which can be expensive. Best bet is doing the above as you will only need 1a out of a 32v power supply. Then you could easily add up to 4 more with another LDD-1000 and still only need 2A.
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Old 09-05-2013, 03:50 AM   #9
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So if I had 32v 2amp supply I could wire that up to the ldd-1000 and I would be good To go? One other thing any way to boost that up to say 600-700 ma? As only running them at 500ma would be a little more than half of there power or is it not noticeable?

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Old 09-05-2013, 05:06 AM   #10
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Quote:
Originally Posted by Mcg177 View Post
So if I had 32v 2amp supply I could wire that up to the ldd-1000 and I would be good To go? One other thing any way to boost that up to say 600-700 ma? As only running them at 500ma would be a little more than half of there power or is it not noticeable?

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You need a more powerful driver to run higher than 500ma when wired that way. Another option is 2 LDD1000 with 2 emitters per driver wired in series. That way you can run the emitters up to 1a with a 24v fv. Then in this scenario you would need a 32v 2a minimum power supply.
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Old 09-11-2013, 10:42 PM   #11
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when wiring in series you add the voltage together of the leds to figure out what voltage you need correct? so 2 x 12v =24v
what about amperage do you add the required amps up? so 2 x 800ma = 1.6 amps at full power.
im trying to do this the ABSOLUTLY cheapest way, while learning more and more everyday
I found some drivers that claim to out put 18-36v and a constant current at 900ma. my thoughts are the voltage would run about 24v and put out the 900ma but in series that would only be about 450ma for each led?
At this point I will probably save up for the mean well eln 60-48d but I just want to know that i'm figuring the math out correctly.
thanks again for answering(teaching) me
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Old 09-12-2013, 01:26 PM   #12
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Quote:
Originally Posted by Mcg177 View Post
when wiring in series you add the voltage together of the leds to figure out what voltage you need correct? so 2 x 12v =24v
what about amperage do you add the required amps up? so 2 x 800ma = 1.6 amps at full power.
im trying to do this the ABSOLUTLY cheapest way, while learning more and more everyday
I found some drivers that claim to out put 18-36v and a constant current at 900ma. my thoughts are the voltage would run about 24v and put out the 900ma but in series that would only be about 450ma for each led?
At this point I will probably save up for the mean well eln 60-48d but I just want to know that i'm figuring the math out correctly.
thanks again for answering(teaching) me
AMPS do not add in series.. but do in parallel...

10 400mA LEDS wired in series needs 400mA TOTAL while voltage would have to be 10x V(f) .....................

I don't know other peoples experience but mine w/ the "big chips" lead me to believe you want to get close to max V as you can.. In this case using 9v X (how even many in series) could possibly cause a very dim situation..




Run 2 strings of 2........... You would need a 24V power supply @1800mA
Same w/ a single driver..

Play w/ this a bit.. You can usually ignore the volt dropping terminator resistors in the case of Constant current drivers.. but it will give you some idea of what you can or can't do
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Old 09-12-2013, 05:53 PM   #13
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Thanks I might go with those drivers I found the 20bucks cheaper than the meanwell

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Old 09-13-2013, 12:22 PM   #14
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Quote:
Originally Posted by jeffkrol View Post

Play w/ this a bit.. You can usually ignore the volt dropping terminator resistors in the case of Constant current drivers.. but it will give you some idea of what you can or can't do
Sorry I forgot the link for this statement:
http://led.linear1.org/led.wiz

After rereading this I can understand the idea behind the 4 in parallel
(12V Computer power supply w/ high amp out since you will need 3600mA for full power though under driving may be beneficial..)

finding a constant current driver w/ that high of amp out is a bit of a problem (availability and cost) though I've never checked around that much for that high of an output..
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Old 09-13-2013, 01:53 PM   #15
tarsman013
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to get the computer PSU to power up, connect the green wire on the 24pin power cable to any black (ground) wire
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