This suggestion is to make a level 1 spell called Light, make a version of it for every caster class, and have it apply a light effect to the caster for something like 20 minutes when cast. The Lantern Archon's light effect comes to mind, if you are keen on re-using effects to save development time.
When I first started playing DDO, I remember going into Heyton's rest and then immediately coming back out. I returned to the bar and went through the spell list to find a Light spell. The dungeon was too dark! Of course, it *did* occur to me that a dark dungeon could be "by design." My issue was bad enough however that it broke suspension of disbelief. I had to resort to altering the game's gamma, brightness, and contrast. Some parts of that dungeon were just too difficult to see correctly on my LCD display.
While that should have been the end of it... I play in windowed mode. In that mode, those settings affect the entire Windows desktop and can make other windows very difficult to read.
Having a light spell that allowed me to pierce the darkness would be truly delicious. Pretty please? ...And summoning a Lantern Archon DOESN'T COUNT, dang it! Anyone who says otherwise deserves to meet hohohohoololo's Spectral Santa Dragon in a dark alley. (See http://forums.ddo.com/showthread.php?t=342481 if you don't get the reference. It's quite a sight!)
Thanks,
Alaunra