The best replacement for sunlight is artificial light.

The best alternatives to sunlight are rated as following:
★★★★★  artificial light
★★★  tanning bed
★★  fluorescent light
★  moonlight
★  darkmoon blade
★  vitamin d supplementation
★  artificial
★  tanning beds
★  indirect sunlight
★  daylight
★  sunshine
  vitamin d
  tanning
  grow light
  artificial light for plants
  tide
  phototherapy
  sunlight
  skylight
  shade
  plant growth
  artificial light plants
  afternoon sunlight
  in shade
  fluorescent light spectrum
  ancient sunlight
  in artificial light

Your alternative for sunlight is not listed? Suggest!
Speaking about sunlight, one probably shouldn't forget about plants.

Other search terms related to sunlight and their ratings are:
★★★★★ plants
★ jaundice
★ vitamin d
You have in mind a companion for sunlight and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of sunlight in all years. Click on graph for more.
sunlight
artificial light
tanning bed