That is the ultimate solution for me. I was never really happy with how bright (or not bright) my LED 3rd was. I will replace it with something better, and include one of those resistors.
If they are the 25 watt resistors, they get a bit hotter than a 25 watt bulb, since all of the energy is dissipated as heat, as apposed to ~90% with a bulb, the rest being light.