The use of penalties such as Thaco +2, AC +2, in a 'dark designated area' if the character doesn't have infravision, an equipped torch in the party, or a light spell in the party will definitely add more atmosphere to the game when travelling in dark dungeons or caves, and it will bring value to magic items related to infravision.
I think I agree with what @Draith012 is saying. Most anything you meet in a dungeon or cave or underdark is going to have infravision. Unless perhaps it's another party with human adventurers. In that case, they should be treated the same way.
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