I just want to say that the links to cancer, obesity and even some of the sleep problems are probably concluded from correlation, not experiments (since you can

I just want to say that the links to cancer, obesity and even some of the sleep problems are probably concluded from correlation, not experiments (since you can't say: hey you, please only use orange screens for the next 30 years and then we scan you for cancer X). And I think this is a problem, since you can't now for sure that wether the cause is blue light or the lifestyle people who are exposed to a lot of blue light have (staying up late, long office jobs, who knows?). To be clear, I do not refute the harm of blue light, I just want to suggest being cautious with the broader health effect claims.