i love love love christmas lights/fairy lights/string lights. I like it when lighting is dispersed rather than directed; I think it's a friendly ambience! but i just hung some LED fairy lights up in my office to replace the lamp usually in there and... i don't know if it's a problem with the lights or if it's a problem with my eyes, but they look like they're shimmering, coruscating, moving at all times like they're shaking back and forth infinitesimally. humbug!