The forward voltage drop commonly referred to simply as forward voltageis a specific value for each LED. You can obtain this from the datasheet of your component. However, i… See more

If you have a digital multimeter, then you can also measure the forward voltage drop. Your meter will have a diode symbol on the front dial, so just move the selector switch to that and … See more

Here is a chart showing the forward voltage by colour for commonly available LEDs on eBay. These are very cheap now and you can get a bag of high brightness light emitting dio… See more

As you can see from the chart above, there are two forward voltages typically used. The red, yellow, and orange LEDs fall into the 1.8 V category, and the white, blue, green, pink… See more