specifically refer to the voltage of the gate items itself on non-phosphor based led items.
as to that applying to logic level outputs when instead being driven by a PSU itself, apples and orangatangs .
Any led can have built into it now amazing curcuitry, there exists a 3mm led that had 3 colored gates (rgb) and built in curcuitry to cycle through the colors. the curcitry smaller than the head of a pin.
they are also working on various colored leds that the colors are phosphor based, not the original gate frequency. so that would also make a world of difference.
but when it comes to the original gate
frequency on commonly use leds, the voltage is commonly known.
basically any led or led curcuit could be set up for an array of voltages, but the semiconductor gate itself on common leds that were getting for cheap, and today,is pretty specific.
so back to the spec sheet, because with any led PACKAGE , the par gate voltage would not mean a lot. if they have something else stuffed into the package.
Many of the things i see marking a Orange as 3V , are just loose specs tossed out to sell stuff, the real actual voltage will be shown when an expert shows the graph, or a user fures up a meter and sees what they are really holding.
the reality spec is when you shove the voltage in and reach the current it is speced for, that will be the voltage you would want to run it at. 1 (mili)ampmeter, 1 adjustable resister, and 2 minutes of time, and long term happyness.Edited by Psycogeek - 8/17/11 at 7:29am