The best replacement for lumen is candlepower.

The best alternatives to lumen are rated as following:
★★★★★  candlepower
★★★  candela
★★★  lux
★★★  watt
★★  mcd
★  footcandle
★  rita
★  hue
★  foot candle
★  lumens
★  cytosol
★  putco
  kelvin
  ansi lumen
  candle
  lumin
  candle power
  lumen
  hannah
  single lumen

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

Other search terms related to lumen and their ratings are:
★★★★★ appendix
You have in mind a companion for lumen and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of lumen in all years. Click on graph for more.
lumen
candlepower
candela