Foil where? Dark foil? Isn't foil shiny? Not sure what you are talking about. The angel eye bulb goes into a socket. The bulb already has chrome around it. Im of the opinion that nothing can be done about the brightness. Super bright LED's are available but IMO run dangerously hot. The brightest LED set i had melted its lens off. The boxes with the resistors also run extremely hot & have melted plastic connectors. Would be happy to hear otherwise.