Flux is a program that runs and change your quality of you screen. While Turn Off the Lights is a popular browser extension where the main purpose is to focus the video player on YouTube website and HTML5 video players on other websites.
That is a software that add a yellow layer on top of everything. But this layer will remove the real contrast and color of the video content.
With Turn Off the Lights browser extension it dims everything around the video player, and it doesn’t change anything in the video content. So, you still can enjoy the high quality of the video online.
If you want to protect you eyes against this straight light, you can use the “Eye Protection” feature in the Turn Off the Lights Browser extension. Where you can enabled it when it’s night example 21:00h.