US Patent 9975788 Optical fluid treatment device

An optical fluid treatment device comprising at least a holder provided with an aperture, a lamp device at least partly located in the aperture. The aperture comprises a fluid passage extending in a main fluid flow direction between a fluid inlet opening and a fluid outlet opening. The fluid passage extends at least partly along the lamp device, wherein the lamp device has an elongated shape extending substantially perpendicularly to the main fluid flow direction.