TL/DR: Use a 1kOhm resistor. Rationale: This LED cannot be used as a bicycle headlight because it is the wrong type. In order to mount an optic suitable for a headlight, ie something with a 15° beam, you need a much smaller LED, much closer to a point source. This LED is way too large, it is meant to be used in floodlights.

This is the reason why it’ll blink fast (hyper-flash). The fix is very simple – install a RESISTOR. This will make your buddy think that it has a bulb in good condition, so it will blink in a normal state. Because our technology is very open to improvements, there are now LEDs that have built-in resistors in it.
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Hook up a 10K resistor and a 9-volt battery (or 9 volts DC from a power supply) to one of your LED's, and measure the voltage across the LED. (You can use any 10K resistor you can find). V=IR, so I=V/R which is 9 / 10K which is 0.9 mA or about one thousandth of an Amp. If we do it more properly (include the forward voltage of the LED in the
One common example is to find the resistor value you need for an LED. Next, you need to consider the power that the resistor needs to dissipate. Power dissipation in a resistor can be calculated with the formula. where P is power in Watt, V is the voltage drop over the resistor and R is the resistance of the resistor in Ohm. Let us look at an
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You may not even need load resistors to switch to LED lights. The best thing to do is to try the lights without load resistors first. No need to purchase something you may not need until you know need it. Load resistors such as # DI34ZR dissipate heat through the body of the resistor. Wrapping them with insulation would prevent them from

Do NOT short the resistor. A resistor is need to allow the LED to operate at its forward voltage. Without a resistor the LED is forced to operate at the battery voltage putting stress on the LED. It is a myth that it's okay to connect an LED(s) directly to a battery. Below is 3 deep blue LEDs at 10 mA.

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do i need a resistor for led