Figure 1. A section of a typical LED light strip. Resistors in this case were for white LEDs. The problem with resistors is that the voltage drop will vary with the number of LEDs connected. Diodes, on the other hand, give a reasonably constant voltage drop of about 0.7 V. We can use this feature. simulate this circuit. Figure 2. Unless you know you're comfortable with SMD soldering, order it with the controller/leds/resistors already soldered. Or just get the Cospad. Those parts come pre-soldered on it, ready for you to add your switches and LEDs. It's also 1/3 the price. Unfortunately as the temperature rises, LED will draw more current at the same voltage - which means even higher temp, higher current, malfunction. This is why high-power LEDs should be always used only with constant-current source and not just series resistors. You can find many LED driver ICs, to which you need only few components. I thought the only reason for fitting resistors to led's was so that when you are indicating they will register on the dash to let you know your indicators are working . I tow some trailers at work with led's and no resistors and they are a pain as you don't know from the cab if your indicators are actually working , don't think you will do the Use a 0.5 Watt SFR16 through hole resistor with formed leads. The 0.5 Watt rated SFR16 through-hole metal film resistors have a 3.2 mm long x 1.9 mm wide body length and the wires can be formed back under the body so it produces contacts which fit 0805 pads correctly with the resistor aligned in any of a number of ways to suit the mechanical situation. ZZHOB 125pcs Pre-Wired Micro LED Pre-soldered 0402 SMD LEDs(No Need Resistor) + Battery Holder & Connector for Beginner Model Building (5 Colors Mix, 125pcs(Each 25pcs)) dummy EDGELEC 56pcs (7 Colors x 8pcs) 12 Volt LED Lights Emitting Diodes Pre Wired DC 12v 5mm LED Assorted Kit Clear Lens- White Warm-White Red Yellow Green Blue Orange Small LED Current Limiting Resistors. LED current limiting resistors help maintain the current at a specified level through an LED that is within the forward current values given in the LED datasheet. To determine the value of a current limiting resistor, the supply voltage (Vsupply), LED forward voltage (VLED), and LED forward current (ILED) values When driving LEDs in parallel you can run into situations where the internal resistances of the LEDs are not matched. Mismatched internal resistance will lead to one LED hogging the current from the power source since the power will look to take the path of least resistance. By hogging the power, the LED will have a shorter lifespan and may 4Yh1WU.