Deceptive Illumination( Drow of the Underdark, p. 50)
Your innate power to create mobile light is far more precise than others'.
Dancing lights as a spell-like ability.,
You can spend a daily use of your dancing lights spell-like ability to cast silent image instead. The illusion lasts for 3 rounds after you cease concentration, but otherwise functions exactly as the spell. Your caster level equals your class level.
You gain one extra daily use of your dancing lights spell-like ability.