Screen brightness can only harm kids that are only few weeks year old. Your kid is 1.5 year old already. Screen brightness has not impact on him. Radiation from smartphone or notebook screen - modern technologies went farm away from tube tv, no need to worry.
I had an experience with my child and this is my experience that will tell you.
It's not just the radiation problem, but if you think the radiation from tube TVs is very dangerous, that's possible.
But it's even worse if my child takes my smartphone to watch a YouTube video with the children's game title Chocomelon and always watches it for more than 30 minutes or even hours, don't you think that's dangerous?
The problem of radiation from the screen is only small (as you said) but the bigger problem is being
"addicted" to playing on your smartphone to watch YouTube or other videos.
What your post even makes here? You keep away device through gambling page can be accessed from a child that is 1.5 year old ? Are you kidding? At that age child give zero interest to gambling and will be keeping giving for few more years. Give him baby shark and stay cool.
No, I don't gamble and I have a principle that I don't gamble and don't want to gamble because I was born in a family that forbade gambling and I married my husband who also forbade me to gamble.
I also suggest on this topic not to gamble in front of children, let alone using a smartphone because usually (my child) when I use a smartphone he always asks me to watch YouTube videos.