why can you not look at a welding flare with your bare eyes but can look at it on tv without eye protection?
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Tv panels can output color in the Red/Green/Blue color space, but cannot display infrared or ultraviolet which is beyond human visible spectrum.
When standing (in person) near a welder, the harmful light produced by the welding arc is in a range that is beyond the visible spectrum in the [ultraviolet range](https://sites.google.com/a/coe.edu/principles-of-structural-chemistry/relationship-between-light-and-matter/electromagnetic-spectrum).
We use sunscreen to block harmful UV (ultraviolet) from the sun. Welding can produce UV rays as well that can damage your eyes if protection is not used.
Edit: phrasing and added a fun link!
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