Related Clues:

• Low, like lights
• Lacking sufficient lighting
• Make lights less bright
• Hard to see because of fog
• Like low lighting
• Faded image partly indistinct
• I'm surprised adding two variables is ill-defined
• Barely perceptible, say
• Barely seen
• Hard to see in
• Much less than brilliant
• End of crossword — I am needing a bit of illumination?
• Low-wattage
• Lower, like lights
• Days in March initially quite dark