The nether portal can be lighten up by given below step:
The lower portal includes an obsidian frame ranging from 4×5 corners to 23×23 corners which need not be obsidian.
Gain a fire-producing tool like flint and steel when the frame is built. Light a fire in one of the frame blocks, and fill the empty space in the frame with a purple block.
What Are The Steps Required To Light A Nether Portal Without Flint And Steel?
The methods available to light a Nether Portal without Flint and Steel
The first is if you’re in the world or the universe:
Take a lava bucket, and place it outside at one of the low obsidian blocks. Then take wooden planks and put one in front of the entrance, next to the lava. It may take a few boards but the door will finally light up on the boards.