Like prawnheed said. Put on the strings you are used to. I use Savarez 510AJ on my flamenco.
What you might have heard is something about old-school flamenco guitarists using lower tension strings. This may have been true, but consider that they would typically play very near the bridge (for stylistic reasons of wanting a brighter and punchier sound).
So the FEEL of their strings would have been like that of a classical played next to the sound hole, strung with high tension strings (because near the bridge the string's stiffness starts playing a significant role in terms of how the string feels and how hard it is to displace it to make a sound).
So I think flamencos may have used lower tension in conjunction with playing very near the bridge because high tension and bridge-playing makes for a very stiff string feel - too stiff. That's my hypothesis and attempt to reconcile the apparent contradiction (fast scale playing AND lower tension??) anyway...