A method and apparatus for reducing cross-talk between pixels in a semiconductor based image sensor. A medium flows around the heat sink by at least sectional guidance of a main flow and a secondary flow of the medium, the main flow being separated from the secondary flow up to a constriction. The method also includes connecting at least two residential fire protection sprinklers to the fluid supply conduit such that the sprinklers are spaced at least eight feet apart from one another, wherein the sprinklers have a K-factor of at least 2.