I THINK a blue star would make him even more powerful and an orange one would make him still superpowered, but weaker as it's closer to red.
So you think his power is related to the wavelength of light and not by the energies outputted by the star, its type or other factors I would think could be more at play than the wavelength of the light.
But who knows?
Are their viloet or ultraviloet "stars"? How would a blackhole effect him?