They cause my husband instant eye pain. Our eye doctor said it is how the eye absorbs or doesn't absorb the light. Older eyes will not be able to & some will feel the pain from it. We can't use any of them in our house. Thank goodness I stocked up on iridescent bulbs long ago. I have enough to see us thru life.
I read an article about the LED street lights in CA. Doctors insisted they were way to bright & would cause eye problems.
They may also cause problems with birds & other animals that need darkness.
We weren't ment to live in bright light 24 x 7.
The thing is it will take many people to end up with a major eye issue before they will change from LED.