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A better way of thinking about it is thus. Helium has a certain spectrum. That is, it only radiates light at certain wavelengths. However, the emitted spectrum covers a pretty hefty span. At lower temperatures, the higher energy transitions don't occur as often, so the color emited by helium would correspond to larger wavelength colors. At higher and higher temperatures, larger energy transitions become more likely, so sorter wavelength light is emitted in addition to the longer wavelengths. This changes the apparent color of helium.
Also, remember that in a star, the energy is large enough to ionize atoms. Ionized atoms/free electrons no longer have quantized energy, so they can radiate at whatever wavelength they want.
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And if you say to me tomorrow, oh what fun it all would be.
Then what's to stop us, pretty baby. But What Is And What Should Never Be.
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