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    Default More LED and power supply questions

    Seeing if anyone can do the math because I'm getting confused trying to work out the numbers for these LED strips and the power source to run them.

    Essentially, I want to run 8 of these lights in parallel off of one power source so I'm seeing if this power source will work.

    Here are the lights and I'll be using 8 of them:

    LED strip

    This is the power source I want to use:

    Power source

    So I guess my question is, will the one power source be sufficient to power all 8 of those light strips or will I need to run 2 power sources, one each for 4 light strips?
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    According to the link:

    0.5 W per led * 36 Per strip * 8 Strips = 144 W of Power needed

    P = IV

    144 = (I) * 12 V

    I = 12 A


    You need at least a 12 A adapter.

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    Not sure about this because LED strips usually go by per ft. etc, but anyways:
    simple math:
    0.5W X 36pcs = 18W (one strip)
    your power supply is only 24W. You would need a 150W power supply (12V) to power 8 of them. Even then its running at 96%, which would heat up and not last long. Could use 100W supplies for 4 strips .

    BTW, i'm no electrician LOL, dont take my word for it.

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    not related to the power because its already been answered, you could probably get the flexible ribbon type strip a lot cheaper and just stick it using the adhesive backing inside a channel/diffuser like the one in your product, the rigid aluminum bar style is really not necessary, i assume its just for under cupboard lighting anyway


    (with reguards to the power, if you're dead set on running it off one supply you'd need something like the 180w version here http://www.ebay.ca/itm/DC-12V-LED-Dr...uh5iSViLgVFe6A )
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    Oh shit! I thought it was .5 watts per strip...not light! I guess what you guys are saying makes much more sense. Thaco, could I use the 200 watt 16 amp power supply just to be on the safe side? Also, is it just a matter of hooking up the 2 wires and if so, which terminals do they go to?
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    Those strips will have a diode they will only power one way.

    Or, red to red, black to black.
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    Edit; nevermind was thinking of different LEDs.
    Last edited by pheoxs; 02-09-2017 at 12:25 AM.

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    yeah too many amps is not a bad thing, too many volts is, as long as its all 12v and more than 180w you're good... as for wiring you'll need a power wire to the wall and one to the strip, for the wall one i usually just take a PC power cord (because i have 100 of them) and snip the end off and use that, it is critical to hook that up properly, but for the low voltage side the wrong polarity wont smoke em, they just wont work if you hook em up backward, also dont trust the wire colour, i have gotten quite a few strips that the wire colour was backward, check the markings on the strip.
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    You might also want to consider 5v strips as well.. LEDs actually run at 3vish so you're just wasting that power with resistors anyway... I don't know how accurate it is but this strip says less than 3 watts per meter so you'd only need like 12-15 watt 5v psu
    http://s.aliexpress.com/6f2YNfmI
    Last edited by Thaco; 02-09-2017 at 09:08 AM.
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    and you'd want to have a controller of some sort to control brightness sometimes they really are too bright especially for under cupboard lighting or something, something simple like this one works well, you normally don't adjust it often anyway https://www.aliexpress.com/item/1Pcs...739330093.html
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    Originally posted by Thaco
    You might also want to consider 5v strips as well.. LEDs actually run at 3vish so you're just wasting that power with resistors anyway... I don't know how accurate it is but this strip says less than 3 watts per meter so you'd only need like 12-15 watt 5v psu USB Cable Power 5V 3528 LED Strip Light 50CM 1M 2M 3M Indoor Decoration String Light Non-waterproof for TV Background Lighting
    http://s.aliexpress.com/6f2YNfmI
    Depends how they're wired. You can run 3-4 LEDs in series at 3V each and have a very small resistor needed.

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    So here's what I'm doing. This is the shelf, the one in the middle. There are 8 shelves in total. I have already ordered 8 of those light stripes, the ones posted above. I have several of those power sypplies lying around and that's why I am wondering if I can use them but if not, I will buy one that can accommodate all 8 strips.



    I am also going to light up the 2 outside shelves the same as I did with my other shelves using that 2amp power source with smaller lights. I guess I'm also wondering if I can get one power source to run all 3 shelves or if I should just stick to one power source for each shelf.
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    Originally posted by Thaco
    You might also want to consider 5v strips as well.. LEDs actually run at 3vish so you're just wasting that power with resistors anyway... I don't know how accurate it is but this strip says less than 3 watts per meter so you'd only need like 12-15 watt 5v psu
    http://s.aliexpress.com/6f2YNfmI
    Damn it. Looking a this now, I should have bought these! They even come with sticky tape! Oh well. I guess I'll just have to buy a power source for the 8 strips that I bought. If I get any other shelves, I definitely get these ones.
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    if you have an old PC power supply you can use one of those, its super easy, just join the green wire to any black wire to emulate it being in the computer and allow the PSU to turn on (you can even put a switch between them if you want to turn it on and off) then hook in to yellow and black for 12v... most PC Psu's from the past 5 or so years is primarily 12v power so practically anything will work for this, its not a lot of power compared to a computer.

    (I have been doing this for bench supplies for years)
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    Originally posted by Thaco
    if you have an old PC power supply you can use one of those, its super easy, just join the green wire to any black wire to emulate it being in the computer and allow the PSU to turn on (you can even put a switch between them if you want to turn it on and off) then hook in to yellow and black for 12v... most PC Psu's from the past 5 or so years is primarily 12v power so practically anything will work for this, its not a lot of power compared to a computer.

    (I have been doing this for bench supplies for years)
    I might have to get you to draw me a diagram because that somewhat went over my head!!

    So essentially, I can use an old power supply from a computer but have to make sure that it's 12 volt. Also, does this mean I won't need to buy that other power source you listed above? Also, would a pc power source be able to handle the 8 lights a 144 watts and 12 amps?
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    Originally posted by LUDELVR


    I might have to get you to draw me a diagram because that somewhat went over my head!!

    So essentially, I can use an old power supply from a computer but have to make sure that it's 12 volt. Also, does this mean I won't need to buy that other power source you listed above? Also, would a pc power source be able to handle the 8 lights a 144 watts and 12 amps?
    Its pretty easy, in the big bundle theres one rgeen wire and a bunch of blacks, just cut the green and a black and twist em together. Then all the yellow wires are 12v just grab one of those for your positive, and another black (or even the green black you already have twisted together) for your negative.

    You'd have to check the power supply for exact specs, but many of them will put out plenty of power for those strips.

    Here's a power supply i have, you can see it has 5 different channels for 12v, each puts out 18a (and 2 or more can be tied together to combine the amperage) to a maximum of 825 watts, Each channel uses a different colour wire, might differ on the power supply, (on this one A is yellow, B is white, C is blue/white, D is yellow/white and E is blueyellow, all of them use black as a ground)
    click for larger version
    » Click image for larger version

    And this is all you need to do to use it for your leds, tie the green and black together and use them as your ground, and use one of the 12v wires for positive.
    click for larger version
    » Click image for larger version
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    Oh nice! Hey, if you have extras, could I buy one of those power sources off of you? Then I wouldn't have to wait for shipping and on the off chance of it not making it to my house as some of my past orders have done. Let me know if you're keen on selling me one of your power sources that will work for my situation. This way too, I'll have tech support right when I buy it!

    Originally posted by Thaco
    Its pretty easy, in the big bundle theres one rgeen wire and a bunch of blacks, just cut the green and a black and twist em together. Then all the yellow wires are 12v just grab one of those for your positive, and another black (or even the green black you already have twisted together) for your negative.

    You'd have to check the power supply for exact specs, but many of them will put out plenty of power for those strips.

    Here's a power supply i have, you can see it has 5 different channels for 12v, each puts out 18a (and 2 or more can be tied together to combine the amperage) to a maximum of 825 watts, Each channel uses a different colour wire, might differ on the power supply, (on this one A is yellow, B is white, C is blue/white, D is yellow/white and E is blueyellow, all of them use black as a ground)
    click for larger version
    » Click image for larger version

    And this is all you need to do to use it for your leds, tie the green and black together and use them as your ground, and use one of the 12v wires for positive.
    click for larger version
    » Click image for larger version
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    Originally posted by LUDELVR
    Oh nice! Hey, if you have extras, could I buy one of those power sources off of you? Then I wouldn't have to wait for shipping and on the off chance of it not making it to my house as some of my past orders have done. Let me know if you're keen on selling me one of your power sources that will work for my situation. This way too, I'll have tech support right when I buy it!

    I sent you a message, i have some here that'd be going for scrap anyway so i can hook you up with one.
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    Alright, so I'm taking a different approach to this now and using this xbox 360 power brick which is 12 volts and 16.5 amps.

    xbox power source

    And I'll never hooking it up using these instructions:

    instructions

    My question is, can I install a switch between the red and blue wire as someone asked in the comments and if I do, does that switch have to be a certain spec?
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