Here's a quick comparison shot(s) of an MR LED string/ladder with the [SMD] resistors taken off. Erv did this a while ago and it certainly does brighten my life up some more, but without the individual resistors - we get a little more of the DIY unevenness that we've all come to love and/or live with...

Lux V blue (unk bin) @1A vs. MR LED string w/o resistors direct drive @6V






Lux V cyan (bin2) @ 1A vs. same string




interesting, eh?