@bzowk Your LEDs are not the high power type that @GoForSmoke mentioned. They may be sold as "ultra high brightness" or some such, but they are just normal 5mm, 20mA LEDs. Their temperature won't change enough to affect their forward voltage significantly. @GoForSmoke is talking about the type of LEDs that are 1W or 3W for example and can take 100s of milliamps and require heatsinks to keep them cool.
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