Lesser/greater Rituals, What are the diffrent uses Options

Ok i've seen it asked many times but have yet to see a answer to the question.

What is the practical diffrence between the greater/supreme and lesser rituals? eg.lbrp and gbrp
I know the greaters uses the spirit pent/hex.This is not really what i'm looking for.
they have diffrent uses what are these uses?

From my own studies its looking like the lessers are use to invoke/banish a single element or planetary force were
the greater ones are for invoking/banishing more then one element or planetary force at a time.

Am I looking at this right?

I'm sure there's more to it but i really don't need a indepth study of it just something to get a idea on the system of magic.

thanks in advance just having these fourms to read has answered alot of questions i've had.

Thanks again Nero you have really cleared up a lot in my understanding of the diffrent rituals.
It gets a bit confusing when diffrent people explain it in diffrent ways not always the correct way (IMG:style_emoticons/default/confused012.gif)
Yeah through my findings i was always comming around to the pent in the Lbrp was not the element earth pent.
I think i read somewhere not to look at the pent as the banishing pent of earth but the banishing lbrp pent to avoid confusion.