The best replacement for black light is uv light.

The best alternatives to black light are rated as following:
★★★★★  uv light
★★★★★  ultraviolet light
★★★★★  uv
★★★  blue light
★★★  glow in the dark
★★  wood's lamp
★★  jetseal
★★  black light blue
★  white light
★  actinic
★  ultraviolet
  ultraviolet lamp
  ultra violet light

Your alternative for black light is not listed? Suggest!
Speaking about black light, one probably shouldn't forget about highlighter.

Other search terms related to black light and their ratings are:
★★★★★ highlighter
★★ cat urine
You have in mind a companion for black light and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of black light in all years. Click on graph for more.
black light
uv light
ultraviolet light