To introduce to students that light is a form of energy, I usually highlight some examples of energy changes to light energy.

Here are some stuff I use for to demonstrate the energy conversion…

Dynamo torch (bought on Carousell):
Kinetic energy to to electrical energy to light energy light energy

Solar chasing light (bought in Kmart, Australia):
Solar energy to electrical energy to light energy

Light bulb:
Chemical energy to electrical energy to light energy

Torchlight:
Chemical energy to electrical energy to light energy