Can a transistor array supply current to a single LED using multiple outputs pins?
May I suggest the following?







simulate this circuit &ndash; Schematic created using CircuitLab

Then instead of 2 levels: 250R and 500R

You get 3: ~260R, 430R, 670R

Of course you'd have to adjust the resistors for the respective power ratings of the components and the brightnesses you want but.. This way you get a bit more versatility for "free".