OK Tcmtech,
Though which camp are you in?..(considering a series parallel array of leds fed by a single current source)....
1a...Series parallel arrays with no limiting resistors and LEDs not Vf matched
1b...Series parallel arrays with no limiting resistors and LEDs are Vf matched
1c...Series parallel arrays with no limiting resistors and LEDs are Vf matched and all from the same production batch
2a...Series parallel arrays allowed , with no limiting resistors, but only if each led string has a minimum of eight in series
2b...Series parallel arrays allowed , with no limiting resistors, but only if each led string has a minimum of eleven in series
2c...Series parallel arrays allowed , with no limiting resistors, but only if each led string has a minimum of (>eleven) in series
3a...Series parallel arrays allowed , with no limiting resistors, but only if LEDs are all operating just above the kness of the I vs V curve
3b...Series parallel arrays allowed , with no limiting resistors, and the LEDs allowed to operate up to their maximum rated current level.
4a...Series parallel arrays allowed , with no limiting resistors, but with what degree of thermal coupling (eg all mounted on MCPCB etc)
5...Series parallel arrays with no limiting resistors not allowed.
If you are in a combination of the above "camps", then please explain.