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Thread: Big W LEDs

  1. #21
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    Wink Re: Big W LEDs

    Hi

    I have been watching this post for some time now and a want to ask.... where do you buy your led light“s ;)

    C - L
    [I]Christmas - Light[/I]

    [COLOR="Red"]2011:[/COLOR]
    [FONT="Courier New"][SIZE="2"]6 x Renard 24 DC (My own design)[/SIZE][/FONT]
    [FONT="Courier New"][SIZE="2"]2 x Renard 24 V3.3[/SIZE][/FONT]
    [FONT="Courier New"][SIZE="2"]2 x Renard 48 LSD[/SIZE][/FONT]
    [FONT="Courier New"][SIZE="2"]1 x Renard 64[/SIZE][/FONT]

    [COLOR="Red"]100 % led lights[/COLOR]
    Thanks to all there is helping me ;)
    [URL="http://www.pcjulelys.dk"]http://www.pcjulelys.dk[/URL]

  2. #22
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    Default Re: Big W LEDs

    a lot depends on which type l want

    Icicles 24volt l get from ebay 21 metres around AUD120

    fairy lights 20 metere 240 volt (roof only) ebay AUD15

    fairy lights 120ct Big W AUD17.54 120 or Adelaide AUD59.00

    Rope light 240 volt ebay 50meters AUD120
    4 ren 64's
    Pretty sure thats enough

  3. #23
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    Default Re: Big W LEDs

    Another update

    Coles branded 126 LED strings. these are two channel strings, RGB & Yellow. Power is 24 VAC.

    I take off the Multifunction controller and test the cable. The Common wire will be POS and the two strings will be NEG.

    I use a 30 VDC Bench power supply and start the string off at 18~20V DC, and slowly bring the voltage up until all the LEDs are illuminated.

    Once the Strings have passed the visual test, I measure the Current on both channels to get an idea of the total power budget. Next, I cut the string between two LEDs and take a current measurement to see how hard the LEDs are being driven. Nominally, I am looking for ~10mA to no more than 15mA per LED.

    As the Strings are RGBY, and two channels, I like to swap the LEDs around to make the string two colours (R and G) (B and Y) or solid colour.

    While it is good to get Solids from RGBY, you need to be careful. RED LEDs have a lower forward voltage:

    RED ~1.7V
    GREEN ~2.2V
    YELLOW ~2.1 V
    BLUE ~ 3.2 V

    Why bother? well the trick they use is to group LEDs by mixing the colours RED and YELLOW, Blue and Yellow etc etc. When you start swapping them around, you are changing the effective Forward Voltage drop for that group of LEDs. e.g. if the strings is groups of nine LEDs, RED will be only ~16V, while blue will be 28V.

    What happens the the REDs? they will conduct more current, and potentially over driving them to failure. you will need to add a current limiting resistor using the standard formula R = V - V(fwd) / I R = (24 -16) / 0.20 A = 400 ohms So a value great than 400 ohms is safe, I go 470 ohm.

    A resistor needs to be added for each group (14 total) for 126 LEDs in groups of 9.

    Hope this helps
    Last edited by wjohn; 11-24-2009 at 07:08 PM.
    [B]John[/B]
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  4. #24
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    Default Re: Big W LEDs

    re Big W LED Extensions
    White, Green and Blue are in strings of 10 LEDs
    Red is in Strings of 15 LEDs

    BTW using A similar method to John below, I ended up with 270R in each string

    Today they went on to my wreath

    Cheers
    Matt
    [B][I]Matt[/I][/B]

    You too can become a Supporting member of DIYC.
    Check it out [URL="http://doityourselfchristmas.com/forums/payments.php"]here[/URL]

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  5. #25
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    Default Re: Big W LEDs

    I poped into coles today for some shopping, to my surprise they had 30% off all xmas lights.

    i picked up a couple of led icicle strings for $18. not fantastic price but not to bad at the same time.

  6. #26
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    Default Re: Big W LEDs

    Quote Originally Posted by scorpia View Post
    I poped into coles today for some shopping, to my surprise they had 30% off all xmas lights.

    i picked up a couple of led icicle strings for $18. not fantastic price but not to bad at the same time.
    How long/led count are they? Price should drop more after xmas and thats when I'm getting mine for the next yrs setup.

  7. #27
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    Default Re: Big W LEDs

    120 multicolor led, 3.1 meters

    24v, 200ma transformer

  8. #28
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    Default Re: Big W LEDs

    The 120 LED Big W (12.1 metre ?) extension strings are now $17.44 or 2 for $25. I bought 2 each of red, blue, green, cool white and multicolour today.

    Not many left on the shelf at the Capalaba store. (mainly blue now) I doubt they'll last until the post Christmas sales.

  9. #29
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    Default Re: Big W LEDs

    Quote Originally Posted by David_AVD View Post
    The 120 LED Big W (12.1 metre ?) extension strings are now $17.44 or 2 for $25. I bought 2 each of red, blue, green, cool white and multicolour today.

    Not many left on the shelf at the Capalaba store. (mainly blue now) I doubt they'll last until the post Christmas sales.
    oooh, I bought some last weekend at 17.44, no 2 to 25..

    Doncaster Big W had Blue and Green, and multi. no Red :-(
    [B]John[/B]
    [url]www.xmasinmelb.com[/url] General Site
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  10. #30
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    Default Re: Big W LEDs

    might check the Big W in town. but doubt they have any in stock as they never any good stuff. Might hoard the entire shelf for my mega tree, might even get a bulk discount :P.

    Coles don't have any but the multicolor sets and only 2-3 of those .

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