I'm playing on a PC with a plasma HDTV. I'm not using any mods yet. I use the candlelight spell a lot.
Oh, well then...that is a different story completely. I too play with a PC and a HD Plasma TV. I would suggest these to aid you in your quest.
Realistic Lighting http://skyrim.nexusmods.com/downloads/file.php?id=7654
Imaginator http://skyrim.nexusmods.com/downloads/file.php?id=13049
These two work great together, without all that overrated ENB mess. That stuff hits your performance and these do not. (maybe one or two FPS) I use stacked combinations of "presets" in the Imaginator for brilliant colors and contrast. Read all the "readme" information.
I highly recommend these tut vids from Gopher. Unless you are familiar with mods. http://www.youtube.com/playlist?list=PL20E326325BADAE44&feature=plcp
With the RL custom, you can tweak the ini file settings to truly customize the lighting settings.