Lighting device for providing light to be used in a photochemical reaction

A lighting device for providing light (114) to be used in a photochemical reaction, wherein the lighting device (100, 100′) comprises:

• an LED unit (110) configured to emit light (114) to be used in the photochemical reaction,
• a housing (120, 120′) configured to house the LED unit (110), wherein at least a part of the housing (120, 120′) is transparent for light (114) to be used in the photochemical reaction, wherein the housing (120, 120′) is configured to contain a dielectric liquid transparent for light (114) generated by the LED unit (110) such that it is in direct contact with at least a part of a light emitting side of the LED unit, and
• a liquid movement arrangement (130) configured to support a movement of the dielectric liquid such that the dielectric liquid transports heat produced by the LED unit (110) away from the LED unit (110).

A method for transporting heat away from an LED unit (110), wherein the method (500) comprises the steps of:

• providing (510) a housing (120, 120′) that is configured to house the LED unit (110),
• providing (520) a dielectric liquid in the housing (120, 120′) such that it is in direct contact with at least a part of a light emitting side of the of the LED unit (110), and
• moving (530) the dielectric liquid in order to remove heat from the LED unit (110).