Manufacturing LEDs that are in a certain Vf group means they will be dimmer?

[treez]

In the excellent Osram application note, titled 'LED diagnosis in automotive applications', page 1 states that because LEDs are optimized for brightness, the other electrical parameters such as Vf, tend to vary significantly when compared to normal silicon diodes.
Does this mean that when you manufacture LEDs to be in a certain tight Vf range, you are sacrificing light output of those LEDs? (in other words, producing LEDs in a tight voltage group means that they will be dimmer, because too much emphasis has been put on meeting the Vf spec?)

"LED diagnosis in automotive applications" ..Application Note
**broken link removed**

 

[dick_freebird]

Illumination LEDs are generally current-controlled and the
Vf is almost a "throwaway" parameter - unless you intend
to match parallel strings, in which case you care about
something the manufacturer doesn't, so much - hence
binning rather than process control.