The invention relates to a method for producing carotenoids or their precursors using genetically modified organisms of the Blakeslea genus. In one example, an agitation stimulus level such as an electrical agitation stimulus is applied to a lipid bilayer wherein the agitation stimulus level tends to facilitate the formation of nanopores in the lipid bilayer. At least one attachment member provides a secure attachment of the housing to the mounting structure. A conductive extraction grid is formed on the dielectric layer substantially in a plane defined by the emitters, and includes an opening surrounding each of the emitters.