I have 5 LEDs Lilypad . They are rated at Forward VOltage of 2V, so I guess this is the voltage required by the LED to light. IF = 20 mA and its rated at 78mW. Im using a drop off V of 1.8V and Im getting that from a 3V source it would require a 60Ω resistor. Im using this web calculator . If I use …

5 Lilypad LEDs in series from 3V source

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