I have a collection of 3 mm and 5 mm LEDs.
The colors are: Red, Blue, Green, Yellow, White
I’m aware of the variation in Forward voltage for these LEDs  (1.8 to 3.4 v).
I always wanted to be able to pickup an LED and just plug it into the breadboard where I need it and not be concerned about supply voltage, or current draw.
I realize the brightness is dependent on both V applied and current drawn. And current varies according to applied voltage and current limiting resistor value.
I thought about constructing a set of LEDs from each size and color with a current limiting resistor soldered in series with one of the LED leads so I could then just grab one and plug it in.
I also realize the choice of brightness of an LED depends to some extent on its purpose.
For example, if it is a simple indicator and it won’t be in brilliant sunshine or other bright light, the a brightness in the middle of its range would be sufficient.
Here we go: Is there a single value resistor for both voltages (3.3 & 5.0) and all 5 mentioned colors that will do the trick?
If so, what value is recommended?
If not, then perhaps a single value for each applied voltage without regard to LED color?
Or, do we break the colors into 2 sets (1 and 2) and ignore the applied voltage and use a resistor for Set 1 and another resistor for Set 2?
I thought I’d ask before I go through the extensive experimentation to discover if what I’d like is reasonably doable.