The Low-Light Vision multiplier of the metallic and chromatic dragons should be 4x, but is currently only 2x. (The Force and Prismatic dragons, from the RSRD Epic rules, have the correct multiplier.)
I think I figured out why, and it is because the regular dragons don't have a line adding the ability Keen Senses (they do have a line "VISION:Keen Senses", but that just seems to add "Keen Senses" to the vision area on the character sheet).
When I added the line to each dragon "class" "1 <tabs> ABILITY:Special Ability|AUTOMATIC|Keen Senses" the 2x bonus (BONUS:VAR|LowLightDistance|2|TYPE=Racial) in rsrd_abilities_monsters.lst for Keen Senses is then applied, bringing it up to 4x.
Adding the tag "DEFINE:LowLightRange|LowLightDistance*60" (which I previously had added to the Epic feat Improved Low-Light Vision) after this brought the Low-Light vision in feet at the top of the character sheet up to the correct values.
This is one I could do, if you approve it.
Completed: At revision: 20156
Added a dragon-specific special ability (under "DRAGONS") to more accurately reproduce what the RSRD says without messing up any others that may use the existing one.
KEY:Keen Senses ~ Dragon
DESC:A dragon sees four times as well as a human in shadowy illumination and twice as well in normal light.
(Low-light vision is now (indirectly) mentioned again, but the "twice as well in normal light" wasn't mentioned before.)