I like to be able to read by the 240mm fans at night, see the keyboard from the power button, that kind of thing.
I actually had a ceramic reptile heat-lamp socket and finned four module AC LED in the case with a psykadelic whirly filter on it for a while but I got nervous when a bug snuck in and made popping sounds.
I don't like how bright the blue on the Zalman ram coolers are in her LGA2011 system, its a LOT of bright light on components that I just need to know are running. They are brutally bright.
Thanks for the comments guys, keep them coming.