The best replacement for light energy is sound energy.

The best alternatives to light energy are rated as following:
★★★★★  sound energy
★★★★★  heat energy
★★★★  dark energy
★★  advocare spark
★  thermal energy
  radiant energy

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Google Trends

Scale is based on the average worldwide traffic of light energy in all years. Click on graph for more.
light energy
sound energy
heat energy