Strips - Always 3 LED's per pixel?

Discussion in 'RGB Lights - Intelligent Pixels and 3-Channel RGB' started by flogger7, Jan 17, 2012.

  1. flogger7

    flogger7 New Elf

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    I may be a bad searcher because I can't seem to find this answer even though I would guess its probably been answered many times.


    Assuming I don't want to have a strip custom made, are digital strips always 3 LED's per IC/pixel?


    Reading the descriptions on Ray Wu's site is difficult as they flip back and forth between 'per strip' info and 'per meter' info and the pictures aren't always of the right item either.


    Thanks in advance.
     
  2. fasteddy

    fasteddy I have C.L.A.P Global Moderator Generous Elf

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    No they also come in 2 LED and 1 LED per pixel. The reason you see the 3 LED per section is because its a 12vdc model, the 2 a 1 LEDs per pixel are usually 5vdc

    1 LED per pixel

    2 LED per pixel

    3 LED per pixel

    the 2 LED i was unable to find in the 2801 but i have seen it before
     
  3. OP
    OP
    flogger7

    flogger7 New Elf

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    Thanks!


    Is there an electrical reason for the 5v being available more dense than the 12v or is that just the way they build them?
     
  4. kane

    kane Dedicated Elf

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    You'll probably get a more technical reply from someone more qualified to give it, but in layman's terms, the individual LEDs themselves don't require a full 12V, they may only require 3.5V. So having 3 for each pixel totals 10.5V, and once you add the current required for the chip, it's not difficult to come down from 12v to there.

    If you try and supply 12V to a pixel that only has one LED that requires 3.5V, you're needing to get that 12V down a lot more, hence why these will usually be 5V strips.
     
  5. vincent81

    vincent81 New Elf

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    As I know, the LPD8806 strip is 2-LEDs cuttable, and they work on DC5V, while the WS2801 strip which input voltage is aslo DC5V, can be cut every one LED. And the 3-LEDs cuttable digital strips includes the LPD6803 strip, DMX512 strip, etc.
     
  6. JonB256

    JonB256 Full Time Elf

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    The TM1809 based strips are one Pixel per Pixel. The TM1809 has 3 RGB outputs per chip. Ray Wu sells it as 12volts, not 5.


    When you look at these flexible strips, you could easily think that the 3 5050 LEDs work together as a single pixel, but they don't. The ones I've seen are 30 pixels per meter, so they have 10 TM1809 IC chips and 30 LEDs. It is "cuttable" on the very visible line after every third 5050 LEDs, but that is because of the TM1809 chip circuitry, not the LEDs.


    http://www.aliexpress.com/fm-store/701799/209843764-425556741/4m-waterproof-LED-digital-strip-by-tube-DC12V-input-without-controller-10pcs-TM1809IC-m-30pcs-5050.html
     
  7. ShellNZ

    ShellNZ Senior Elf

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    WS2811 are also 10ic/30led
     
  8. smeighan

    smeighan Dedicated Elf

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    for 12v flex strips
    firs the cheapest lights that you can buy (per meter). These are grouped in 3's like the LOR ccr
    ws1811, 12v. $4.80/m. 30leds/m
    http://www.aliexpress.com/store/product/5m-led-digital-strip-DC12V-input-WS2811IC-256-scale-10pcs-IC-and-30pcs-5050-SMD-RGB/701799_568458133.html




    Now all the individual addressable lights for flex strips


    ink1003. $8/m. 30leds/m
    http://www.aliexpress.com/item/5m-DC12V-INK1003-led-pixel-srip-IP68-30pcs-1002led-5050-RGB-with-bulit-in-INK1003-IC/1610807722.html


    tm1809, $10.50/m. 30 leds/m
    http://www.aliexpress.com/store/product/4m-waterproof-LED-digital-strip-by-tube-DC12V-input-without-controller-10pcs-TM1809IC-m-30pcs-5050/701799_425556741.html


    tm1812. $10.40/m. 60 leds/m
    http://www.aliexpress.com/item/5m-DC12V-60leds-m-and-5pcs-TM1812-ic-meter-20pixels-led-digital-strip-IP68-waterproof-in/1342894421.html


    the ink1003 looks like a wes2811 (the cheapest per meter flex strip) , but it does individual pixel lights. There was a problem with the e682 running the ink1003 since they apparently run at 800khz speed. most of the lights on here run at 400khz. The falcon controllers work on both since dave pitts adjusted his controllers to a sweet spot between the two frequencies. jim st john has come out with a patch for the e682 that makes them work. i have not heard if anyone has tested the p12r or p12s on the ink1003. All other lights on here should work across all controllers.


    thanks
    sean
     

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