The lighting is a new mt feature that is just added, can be applied on each player, it controls the bright / light balance & saturation.
As you can see on the pics the "new" ones has more light & is more colorfull.
We can make the environment bright/light up, but not in complete darkness yet.You should be able to see more than just white. I don't think that could be done in Minetest but that would be ideal
It's a recording from my phone, i will try to make a more clear flash sound.The sound effect could be better
I prefer to use nodes instead of objects cuz objects can only exists 50 blocks away from players then you cant see lightnings far away that we usally do in real life.