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This question gets asked every day in Answers and the Forums: What resistor do I use with my LEDs? So I've put together several different ways to figure it out. Lets get right to it:
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My question is, what resistor value should I use to power the standard (14) white LEDs with 5V from the USB cable? I've attached a photo of HF flashlight circuit boards, one with all the LEDs still attached and the other that I'm modifying, including sanding the tops.
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The first and most simple solution is to fit a CANbus compatible bulb. Bulbs like the Twenty20 Cree LEDs and some of the Ring Premium range have additional resistors built into them to adjust the characteristics of the bulb. This brings them closer to the parameters that your car is looking for.
10 kwi 2012 · I'd like to use the LED flashlights innards from Harbor Freight on the kid's PowerWheels cars for headlights. The cars are 12v, the flashlights require 3 AAA batteries each (4.5v). What is the best way to power these from 12VDC ?
