lamp + the number of kelvins + diameter contact + type
i usually either search for the type of lamp (wall lamp, table lamp, bedside lamp, etc.) or specifically for the brand name and the name of the lamp.
lamp and then the brand - or the specific lamp that is desired.
gold ceiling lamp
i first go to ikea's website (or other well-known companies). otherwise, i don't just type the word "lamp," but maybe additional words like "table lamp" or something. lamps are not something i search for that often anyway.
i just google "wall lamp" and see what comes up. most often it's on the phone.
seaweed on sale
lamp, cozy lighting
cheap lamp / lamp on sale / lamp for living room / lamps