A flash irradiation device includes: a light-emitting tube sealing a light-emitting gas inside; a pair of discharging electrodes being arranged distant from each other in the first direction; a reflecting member that is disposed on an opposite side of the light-emitting tube from the workpiece; a pair of trigger electrodes on an outer wall surface of the light-emitting tube or in a vicinity of the light-emitting tube, the pair of the trigger electrodes being arranged distant from each other in the first direction; a lighting circuit connected to the pair of the discharging electrodes, the lighting circuit being configured to supply electric power between the pair of the discharging electrodes; and a trigger circuit connected to the pair of the trigger electrodes, the trigger circuit configured to apply a voltage for starting lighting across the pair of the trigger electrodes.

A flash irradiation device includes: a light-emitting tube sealing a light-emitting gas inside; a pair of discharging electrodes being arranged distant from each other in the first direction; a reflecting member that is disposed on an opposite side of the light-emitting tube from the workpiece; a pair of trigger electrodes on an outer wall surface of the light-emitting tube or in a vicinity of the light-emitting tube, the pair of the trigger electrodes being arranged distant from each other in the first direction; a lighting circuit connected to the pair of the discharging electrodes, the lighting circuit being configured to supply electric power between the pair of the discharging electrodes; and a trigger circuit connected to the pair of the trigger electrodes, the trigger circuit configured to apply a voltage for starting lighting across the pair of the trigger electrodes.

In an example, a method of operating an ultraviolet (UV) light source includes providing a supply power to the UV light source, and activating, using the supply power, the UV light source to emit UV light during a series of activation cycles. The method also includes, during at least one activation cycle in the series, sensing the UV light emitted by the UV light source to measure an optical parameter of the UV light. The optical parameter is related to an antimicrobial efficacy of the UV light. The method further includes adjusting, based on the measured optical parameter, an electrical parameter of the supply power to maintain a target antimicrobial efficacy of the UV light over the series of activation cycles.

In an example, a method of operating an ultraviolet (UV) light source includes providing a supply power to the UV light source, and activating, using the supply power, the UV light source to emit UV light during a series of activation cycles. The method also includes, during at least one activation cycle in the series, sensing the UV light emitted by the UV light source to measure an optical parameter of the UV light. The optical parameter is related to an antimicrobial efficacy of the UV light. The method further includes adjusting, based on the measured optical parameter, an electrical parameter of the supply power to maintain a target antimicrobial efficacy of the UV light over the series of activation cycles.

In an example, a method of operating an ultraviolet (UV) light source includes providing a supply power to the UV light source, and activating, using the supply power, the UV light source to emit UV light during a series of activation cycles. The method also includes, during at least one activation cycle in the series, sensing the UV light emitted by the UV light source to measure an optical parameter of the UV light. The optical parameter is related to an antimicrobial efficacy of the UV light. The method further includes adjusting, based on the measured optical parameter, an electrical parameter of the supply power to maintain a target antimicrobial efficacy of the UV light over the series of activation cycles.

In an example, a method of operating an ultraviolet (UV) light source includes providing a supply power to the UV light source, and activating, using the supply power, the UV light source to emit UV light during a series of activation cycles. The method also includes, during at least one activation cycle in the series, sensing the UV light emitted by the UV light source to measure an optical parameter of the UV light. The optical parameter is related to an antimicrobial efficacy of the UV light. The method further includes adjusting, based on the measured optical parameter, an electrical parameter of the supply power to maintain a target antimicrobial efficacy of the UV light over the series of activation cycles.

There is provided a light-emitting device capable of suppressing a decrease in a light emission amount. A light-emitting device including a container member including a ceramic package provided with a depressed portion serving as a discharge space, and a light transmitting member which is attached to the ceramic package via a joining layer formed of a joining material so as to close the depressed portion; an inert gas encapsulated inside the discharge space; and a couple of discharge electrodes which are disposed in the depressed portion of the ceramic package so as to be spaced from each other, the joining material including glass exhibiting a white color, and oxide ceramic powder.

There is provided a light-emitting device capable of suppressing a decrease in a light emission amount. A light-emitting device including a container member including a ceramic package provided with a depressed portion serving as a discharge space, and a light transmitting member which is attached to the ceramic package via a joining layer formed of a joining material so as to close the depressed portion; an inert gas encapsulated inside the discharge space; and a couple of discharge electrodes which are disposed in the depressed portion of the ceramic package so as to be spaced from each other, the joining material including glass exhibiting a white color, and oxide ceramic powder.

A flash light source device includes a flash lamp, a wring board, and a power feeding unit. The flash lamp includes a sealed container provided with a light transmission window on one end face and having a discharge gas enclosed therein, a cathode and an anode to induce arc discharge in the sealed container, and lead pins projecting from the other end face of the sealed container. The wiring board has a principal surface and a back surface. The lead pins of the flash lamp arranged opposite to the principal surface are bonded so as to be fixed in an electrically conductive manner to the wiring board. The power feeding unit implements charge and discharge of an electric current to be supplied to the flash lamp. The power feeding unit has chip capacitors surface-mounted on the wiring board.

A flash light source device includes a flash lamp, a wring board, and a power feeding unit. The flash lamp includes a sealed container provided with a light transmission window on one end face and having a discharge gas enclosed therein, a cathode and an anode to induce arc discharge in the sealed container, and lead pins projecting from the other end face of the sealed container. The wiring board has a principal surface and a back surface. The lead pins of the flash lamp arranged opposite to the principal surface are bonded so as to be fixed in an electrically conductive manner to the wiring board. The power feeding unit implements charge and discharge of an electric current to be supplied to the flash lamp. The power feeding unit has chip capacitors surface-mounted on the wiring board.