Stable PCB for solid state light source application

A lighting device comprising (i) a light source configured to generate light source light, wherein the light source comprises a solid state light source, and (ii) a support configured to support the light source, wherein the support comprises a metal based thermally conductive material, wherein the lighting device further comprises (iii) a layered element, configured in physical contact with the support, wherein the layered element comprises one or more layers, wherein the layered element at least comprises an electrically insulating first layer, wherein at least part of the layered element is configured between the light source and the support such that during operation part of the light source light irradiates the layered element, wherein the layered element further comprises a layer of light reflective particles, wherein at least 30 wt, % of the particles have a flake-like shape and wherein the layer is an essentially closed layer of aligned flake-like shaped particles whereby essentially all light source light that is directed to the layered element is reflected back in a direction away from the support.