H7 Headlight bulbs?

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para san ba talaga to? nababasa ko kasi some use it as healights, some as foglights.
it looks like an H4 bulb except na single beam lang sya and 2 lang paa nya. I have a 4 lamp headlight assemply so hiwalay yung hi and low and di ko naman ginagamit yung hi beam part ng H4 so nasasayang lang. I was thinking kung pwedeng H4 na lang gamitin ko.
same lang ba socket nito, ceramic sockets na kasi gamit ko.

and, alin mas mura assuming same brand and specs? H4 or H7?
tia.