Scalar Field Dark Matter Quantum Effects as Dark Energy

Using very simple arguments we show that the quantum effects of an ultra-light particle as the Scalar Field Dark Matter $m_{SFDM}\sim {10}^{-22}$eV cannot be neglected at classical scales. We show that the effective density of this effect is constant in the space and for such a mass, it is of the order of magnitude of the critical mass of the universe. Thus, we can interpret the effective density of this quantum effect as the cosmological constant.