Here I have summarized useful links based on just my interest. Hope these links are useful to you as well. If you find any misssing link, please do not hesitate to contact me.
First link is a sort of my personal one. This is a link to my brother's company in Japan
My brother's on-line shopping site for light bulbs
My brother has another on-line shopping site for the best selected foods in Japan
(again Japanese only)