Two Angstrom Towards the Blue End

The blues-shift of deuterium relative to hydrogen can be calculated from standard theory. It can also be confirmed in laboratory experiments.

What should be noted is that the deuterium spectrum comes out at about 2 angstrom towards the blue end of the spectrum as compared to hydrogen.

Heavy isotopes emit bluer light than lighter ones

It follows from this that an increase in mass of atomic nuclei will shift the light spectrum of the affected matter towards the blue end of the spectrum.