I notice from time to time on these RL's 2000-2004 that the headlights seem to build condensation inside them overtime.... Why and or how does one avoid it?

Thanks.

That's weird, I have never experience this maybe my headlight is retrofitted. I had to cut a big gap to fit the projectors and i didn't completely seal the headlight, no moisture or condensation for me. Anyway, I think either the hole is clogged or the rubber seal has a big gap. You can use a hair dryer or remove the rubber seal and the light bulbs and drive around for several minutes to remove the condensation. Hope that help.

No problems here in both my 01 and 04 RL's....

I never had condensation inside the headlights. I'd check the rubber seal underneath the headlight.