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Not that I know of. Actually, the only way you can tell that fusion has begun in the core of a star is to measure the neutrino flux from the core. Normally, it takes light (photons) several million years to reach the surface of a star and any that were produced by nuclear reactions are no exception. For awhile, the light coming from the star would be that generated by it's pre-main sequence state. However, if there was a large and sudden flux of neutrinos from the star, it would indicate that nuclear reactions had begun in the core.
Eventually the light coming from reactions in the core would breach the surface and then it could be said to be shining by the light of nuclear reactions.
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