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This is not correct. Well it depends on what you mean by PROPER resistor. You can resist for rated output (they WILL over heat) or you can resist for heat control.
If you run them at their RATED output they will over heat without adequate cooling. For passive cooling 9 cm/2 per watt of consumption is usually what is suggested.
thats why I suggest running them for heat control resistance NOT rated output resistance. IE add more LED's so you are under utilizing them and therfore eliminate cooling issues.
you need to run them for at least 30 minutes AT 90' F and see how hot they get. They should not get hotter than 95' to be safe (this assumes a hot summer day)
I tried to arrange it so my led's never run more than 5' above ambient in the hottest weather I am likely to encounter.
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