SMD = Surface Mount Device, that is, a chip LED, transistor, capacitor, resistor
As opposed to an axial lead device, those 2-contact devices with a solid, rigid wire emerging from each end of the resistor or capacitor or diode
On another note: Each colour of LED & size requires different energy. Each colour requires a certain voltage across the internal LED junction. The difference between the power source voltage & what the LED requires is absorbed by the series resistor, often referred to as the ballast resistor.
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Agreed in all aspects of the virtues of the LED's. Cool operating, long life, and a host of available colors. The smallest "chips" can fit into tiny places and easily light up running lights, deck lights, and if run on lower voltage than what they're rated at will produce a lower brightness.
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"Good judgment comes from experience, and a lot of that comes from bad judgment." Will Rogers.
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Nick This is one of my Tug's, I used 0402 size SMD for all the lights. here is a like to a resistor calculator that I have used that worked for me. Fred
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