NurdRage

No, if the correction proportions are used the reaction wouldn't behave that way. The moment a tiny portion of Na2S is created it would react with the sulfuric acid and generate H2S. This would then produce Na2SO4 and stop further reaction since you'd consumed the sulfuric acid faster than what your ideal reaction asserts.The chemicals don't just hang around and wait for everything to complete. If multiple competing reactions can happen then they will happen. They don't stop and behave nicely just because you use the correct proportions. This is why H2S is always a danger.

It is, after all, what do you get when you react sodium sulfide with sulfuric acid?

What do you mean? How would your proposal be different from the video?

I'm not sure if this particular phosphor has second harmonic generation, but i think in this case it's a total non-issue due to the extremely low intensity of the light. Second harmonic generation occurs best with high intensity light and is usually only significant if you can pump laser light into your substrate. At normal intensities you find in everyday light it's totally insignificant and at the extreme low end in these tritium lights i doubt its even measurable above the noise of your sensors.