Emptiness is not a vacuum. Emptiness is the reality of ALL
phenomena, it is not about some formless attribute of luminosity.
In Buddhism, our luminous aspect has no monopoly.
In Buddhism, we say that all phenomenon existence exhibit the
characteristics of emptiness -- emptiness of inherent existence,
and is ungraspable and unknowable. Being empty is not void, it just
means that it arises as interdependent origination, conditioned
arising, with no separate existence.