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radjanair
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Joined: Oct 28, 2012
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 Posted: Sat Dec 01, 2012 10:55 pm Post subject: 3 W x 4 LED running on 12V 5A adopter |
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Hi,
Can I use 3W x 4 LED on 12V 5A adopter.
Please help me.
regards
radjanair |
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Minnu
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Joined: Feb 18, 2010
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Location: Chennai
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| Posted: Sun Dec 02, 2012 12:36 am Post subject: Re: 3 W x 4 LED running on 12V 5A adopter |
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Nope, Its not possible to Run 3 W * 4 LED on a 12V 5 A driver.
Each 3 W LED run on current of 700 MA and if you connect them 5 A driver they would for sure get burned of.
Each of your 3 Watt LED run's in 3-3.5 V and if you connect them in series they would use the 12 V but the current suplied on this series in 5 A. You would require additional 6 more much parallel connection.
Do refer the below link it would give you useful information about wiring your LED.
http://led.linear1.org/led.wiz
Regards
Praveesh |
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radjanair
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| Posted: Sun Dec 02, 2012 9:23 am Post subject: Re: 3 W x 4 LED running on 12V 5A adopter |
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Hi, Praveesh
Thank You. I am now using it for a month. Nothing happened. If I add another 6 more 3w*4 leds in parellel, will the power supply adopter 12v 5A get heat. Please help.
If I use totally 28 leds like this, how many white and blue I can use for my aquarium. My Aquarium size is 31"(L) x 15"(W) x 17" (H) for planted tanks.
radjanair |
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saikumar
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| Posted: Sun Dec 02, 2012 9:44 am Post subject: Re: 3 W x 4 LED running on 12V 5A adopter |
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Praveesh, wouldnt the LEDs short the powersupply because of the very low resistance?
Rajan, you ll need atleast 2/3rd of what you'd have used with normal fluroscent lights, with the point of LEDs being 30% better. Now next question to you is- are your LEDs 30% better than the fluroscents?
EDIT: I went through your posts, and realized what you have is a 5A is a driver not mere SMPS. So you should be good if you use up all 12V X5A, i.e. Appx 60W, meaning
4 LEDs per string(~12V/3.6V) X 6 strings (5A/0.75A). And as suggested by a few using to run just a couple might damage the LEDs.
Had you provided the parameter LUMENS per each LED we could calculate how many LEDs you ll need for the tank. |
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marlon12
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Joined: Jun 12, 2012
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| Posted: Mon Jan 14, 2013 9:48 am Post subject: Re: 3 W x 4 LED running on 12V 5A adopter |
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hey Rajan
have you succeeded in your quest of increasing the no of LEDS
would like to know as me also planning to switch to LED lighting for my aquarium
marlon |
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radjanair
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| Posted: Mon Jan 14, 2013 11:33 am Post subject: Re: 3 W x 4 LED running on 12V 5A adopter |
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@saikumar
the details of the led
3W - 700ma - 3.6/3.8V 182-200Lum (white) |
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raghavarao
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Joined: Jul 13, 2011
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| Posted: Mon Jan 14, 2013 1:26 pm Post subject: Re: 3 W x 4 LED running on 12V 5A adopter |
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it is ok to run 4 leds in series, your power supply is 12V 5A so only 3V will taken for each LED with appropriate resistor in series.
You can run up to 8 series in parallel.
if your led gives 700mA when supply is 3.6V each led
then for 3V it will be less current.
ok one series willbe 700mA ie 0.7mA
then example 6 series X 0.7mA = 4.2A is the total current consumtion. 0.8A is for buffer.
Be Safe if any one resistor burnts in series the all LEDs will fire. Use FUSE about 0.8A in all series for safety.
Rao |
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radjanair
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| Posted: Mon Jan 14, 2013 1:57 pm Post subject: Re: 3 W x 4 LED running on 12V 5A adopter |
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@marlon12
not yet now. I am out of station. |
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radjanair
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| Posted: Mon Jan 14, 2013 1:58 pm Post subject: Re: 3 W x 4 LED running on 12V 5A adopter |
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| Can anyone suggest, how many white and blue I can use for my aquarium. My Aquarium size is 31"(L) x 15"(W) x 17" (H) for planted tanks. |
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