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AusChristmasLighting 101 Manual
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[QUOTE="i13, post: 121643, member: 21708"] I read the 193mA from the picture of the plugpack but the other information that you gave me helped me approximate it. The fact that each channel has its own wire plus the common positive means that this is likely to be a single polarity string. This means that all LEDs can be turned on at the same time so the plugpack should be rated accordingly. 31V strings usually have their LEDs in series sections of approximately 10 LEDs. There could be parallel sections in series or series sections in parallel but it doesn't matter much for this calculation. I think this string has series sections in parallel because that's usually how 4 channel strings are wired, especially when there's one wire per channel plus the positive. 144 LEDs is not divisible by 10 but it is divisible by 9. I therefore think that this light set has series sections of 9 lights each. Dividing 144 by 9 gives me 16 series sections of LEDs. The fact that 16 is divisible by four channels gives me more confidence that I am on the right track. Each section is usually run at around 10mA. Multiplying 10mA by 16 gives me 160mA as my approximation for the current draw of this light set. 193mA on theplugpack therefore seems like a reasonable value. The plugpack's current value can't be used like this if it is a connectable light set. If my assumptions are correct, this light set has series sections in parallel and four series sections per channel (16 sections divided by 4 channels) which means that: [LIST] [*]Most LEDs will have two wires connected to them but a few of them will have three wires. [*]There will be 9 wires in most places along the light set. There will be two places where this reduces to 5 wires. In addition to this, the far end of the string will have 5 wires for a longer distance. [*]There will be 36 LEDs (four sections of 9 LEDs, one for each of the four channels) between each place where there are 5 wires. [/LIST] I would like to know where you bought this light set. 4 channel 31V traditional LED strings are uncommon but great for sequencing. In addition, I think this is a single polarity LED string which means there are a large number of controllers that support it and it is slightly brighter than reverse-polarity strings. I'm not sure about the reason behind the current ratings of the controllers. It is probably a limitation of the wiring and/or mosfets. I would assume that it is specific to the controllers that you have found. Could you post some links to where they are sold? Some of the 7-24V controllers might be able to handle slightly higher voltages. One example is the 27 channel controller sold by Ray Wu. It can handle 35V DC: [URL]https://auschristmaslighting.com/wiki/HD712[/URL] Don't buy this controller without checking that my assumptions are correct. I would also suggest researching your options and deciding which controller is best for you. This one is reliable but it has no fuses and its current capacity is limited unless you modify it slightly. [/QUOTE]
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The title of our introductory lighting manual contains a three digit number. What is that number? Clue: Display basics forum
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