LED resistors
Which can be in the form of either a voltage or current . For example, a lot of people report buying 5V blue LEDs. These are really not rated to operate continuously at 5V in most cases. The other thing that is very important to mention is the idea that it’s more useful to talk about driving an LED with a current of a particular size, instead of a voltage. If you know the voltage across an LED, you cannot determine the current flowing in it, unless you are operating it at the exact point along the curve that’s described in the specs. More over being if you are being off by a little then the forward voltage can have a drastic effect in the current. So the approach that one should prefer is to select a current-limiting resistor in order to achieve a target current in the LED. Most 3mm and 5mm LEDs will operate close to their peak brightness at a drive current of 20 mA. This is a conservative current it will not exceed most ratings ,your specs may vary, or you may not have any specs, in this case 20 mA is a good default guess. In most cases, driving the LED at a higher current will not produce substantial additional light. Instead, the junction which is the working parts of the LED has to dissipate the excess power as heat. Heating the junction will decrease its useful life, and can reduce the output of the LED substantially. Heating it enough will cause catastrophic failure producing a dark emitting diode. All these factors explain how and why LEDs require resistors for proper working. LED resistorsAbout the Author:Article Source: ArticlesBase.com - LED resistors
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