Accelerated rotation of stars in the galaxy

Accelerated rotation of the star because of the difference between the effective gravitational mass and real inertial mass.
For baryonic matter the gravitational mass is equal for the inertial mass (Einstein's postulate). For light the inertial mass is still zero but the effective gravitational mass may be assumed (the light deviates near the star). If the enormous amount of light is trapped inside the star, the overall effective gravitational mass of the star Mg may be larger than the effective inertial mass Mi. How it will influence the rotation of the star around the galaxy center?
From Newton mechanics:

m_i*v²/R=G*m_g*M/R²  and v=[(G*M/R)*(m_g/m_i)]^1/2

where G is gravitational constant, M is effective mass of the galaxy (for simplicity), v is the linear velocity of the star around center of galaxy, m_g is the effective gravitational mass of the star,  m_i is the inertial mass of the star, R is the radius of rotation. If due to the trapped light the effective gravitational mass is much larger compare to inertial mass, so the velocity of the rotation. In this case the dark matter is not necessary for the accelerated rotation of the stars in the galaxy