Posted by jimg.allentown on October 07, 2016 at 07:51:04 from (173.49.143.137):
In Reply to: LED lights posted by gary in neb. on October 06, 2016 at 08:42:59:
It is my understanding that LED lights draw much less current than their incandescent counterparts. As such, they have a few advantages and disadvantages. Advantages are that they draw less current for the same amount of light. They generate less heat so that they can be used where the heat generated by a normal bulb would be an issue.
Disadvantages are that they are not an EXACT drop-in replacement for incandescent bulbs. In older cars, they do not draw enough current to make the flasher work. In traffic lights, they do not generate enough heat to melt the snow that accumulates on them in the winter.
As to "ballast" or "resistor," here is my take: A ballast is used with fluorescent, mercury vapor, and HID types of bulbs.
A resistor would be used either to simulate a load or to drop voltage. In the case of an automotive application, a normal bulb loads the flasher. The bimetallic strip in the flasher heats up and breaks contact. When it cools down, it restores the contact completing the circuit. This happens rapidly enough to cause the bulb to flash. With an LED, the resistor provides the load so that the flasher will work correctly. On newer vehicles, electronic flashers are used that "sense" the load and flash accordingly. They can be recalibrated to work with LEDs.
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