Prob. a very basic Q re: capacitors

How is the flow of power out of a charged capacitor be controlled? I've
been loking at whatever circuit diagrams I can fond that use
supercapacitors as an energy source, and I'm not clear on whether control
is via the resistors, or transistors.

I've seen a few products described as being solar-charged battery-free LED
lights that use a supercapacitor ratehr than a battery, but do diagrams -
if anybody knows of one, would you mind posting a link...? I've been
Googling for circuits and/or application notes, books as well, but with
scant results over th past few days, so I don't know whether they just
aren't on-line, or whether my search commands are faulty.

Thanks In Advance!

- Kris

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