For a particular intensity of incident light on a silicon pn junction solar cell, the photocurrent density (J_L) is 2.5 mA/cm² and the open-circuit voltage (V_OC) is 0.451 V. Consider thermal voltage (V_T) to be 25mV. If the intensity of the incident light is increased by 20 times, assuming that the temperature remains unchanged. V_oc (in volts) will be ______.