Artificial sunlight was sunlight given off by artificial suns.
The Sunlight Worlds were lit by artificial sunlight. (PROSE: The Dalek Generation) The Collector used six artificial suns to light Pluto. (TV: The Sun Makers)
The Daleks claimed to offer the Thals fresh vegetables that were created with synthetic sunlight. (TV: "The Escape")
The vep was a unit used for artificial sunlight. (The Dalek Book)