Is there such a thing as filtered LEDs?
I think this is just a misuse of terminology, and you should read it as merely specifying a white LED with a color temperature of 3000 K.

An incandescent bulb might indeed be filtered to adjust the color of its light, but white LEDs instead use phosphors to produce the desired spectrum starting from monochromatic blue light. A filter after that would just be wasteful compared to using the right phosphor mix to start with.

Just buy an LED whose specified color temperature is 3000 K. Or don't, and choose whatever color temperature you like — this affects the light output, not the electrical behavior, and is purely an aesthetic choice unless the produced light is being is used in some precision application  rather than room lighting or as an indicator. The circuit will not care.