1. A light illumination control device comprising:
a computing processing device that controls a driving state of a light-emitting diode as a light source of a light; and
a boost circuit, wherein
the computing processing device includes a switch-on detection unit that detects switching from an OFF state to an ON state of an illumination switch that turns on and off the light-emitting diode, and
the computing processing device stops a boosting operation of the boost circuit in accordance with that the switch-on detection unit detects that the illumination switch has switched from the OFF state to the ON state, thereby bringing an output voltage value of the boost circuit to a value lower than a forward voltage value of the light-emitting diode.
2. The light illumination control device according to claim
1, wherein
the computing processing device further includes a low voltage detection unit that detects that the output voltage value of the boost circuit has become lower than a forward voltage value of the light-emitting diode, and
after the low voltage detection unit detects that the output voltage value of the boost circuit has become lower than

the forward voltage value of the light-emitting diode, the computing processing device controls the output voltage value of the boost circuit so that a current value flowing to the light-emitting diode becomes a target value.
3. The light illumination control device according to claim 1 or 2, further comprising a protection bypass circuit constituted of a switching element in which a first terminal and a second terminal are connected between the boost circuit and the light-emitting diode, and a voltage or a current applied to a third terminal controls a current flowing between the first terminal and the second terminal, and of a resistor element connected in parallel between the first terminal and the second terminal of the switching element, wherein
the switch-on detection unit detects a difference value between a voltage value on an upstream side of the protection bypass circuit that corresponds to the output voltage value of the boost circuit and a voltage value on a downstream side of the protection bypass circuit that corresponds to the forward voltage value of the light-emitting diode, and
when the illumination switch switches from the OFF state to the ON state, it is detected that the difference value between the voltage value on the upstream side of the protection bypass circuit and the voltage value on the downstream side of the protection bypass circuit has become equal to or higher than

a predetermined voltage value, and accordingly, the computing processing device stops the boosting operation of the boost circuit, thereby bringing the output voltage value of the boost circuit to a value lower than the forward voltage value of the light-emitting diode.
4. The light illumination control device according to claim 1 or 2, further comprising a protection bypass circuit constituted of a switching element in which a first terminal and a second terminal are connected between the boost circuit and the light-emitting diode, and a voltage or a current applied to a third terminal controls a current flowing between the first terminal and the second terminal, and of a resistor element connected in parallel between the first terminal and the second terminal of the switching element, wherein
the switch-on detection unit detects a voltage value on a downstream side of the protection bypass circuit, and
when the illumination switch switches from the OFF state to the ON state, it is detected that the voltage value on the downstream side of the protection bypass circuit has become equal to or higher than a predetermined voltage value, and accordingly, the computing processing device stops the boosting operation of the boost circuit, thereby bringing the output voltage value of the boost circuit to a value lower than the forward voltage value of the light-emitting diode.

5. The light illumination control device according to any one of claims 1 to 4, further comprising a discharge circuit that discharges an output voltage of the boost circuit when a boosting operation of the boost circuit is stopped.