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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The really dangerous part of a welding flare is the UV. It will basically give your eyes sunburn (I’ve done it before, it’s very unpleasant).
When your TV is reproducing the picture of the weld it it’s just doing its best to show the visible part of it, it’s not generating the same amount of UV that the actual flame does.
That “doing it’s best” is also important. There is a limit to how bright your TV can make something. The actual welding equipment doesn’t have the same limitation.
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