The difference is that when you are outside in the sun, there is visible light too, which means your pupils are about 2mm. When you are in a dark room, they ca

The difference is that when you are outside in the sun, there is visible light too, which means your pupils are about 2mm. When you are in a dark room, they can be up to 8-9mm. This means 15x more light allowed in. I am not saying that the LED in the video will destroy your eyes, but I do wonder if the eye-pain induced by the iPhone X that I had the past year is because of that.