Please someone explain the headlight relay mod

[69C-owner]

I wanna know the mechanics of this, how does it change the operation of your lights, how do the low and high beams both burn brighter and also what's the big deal with relays, I've always assumed a 4 blade relay is a 4 blade relay and same go's for the 5 blade ones. I have three relays mounted on one bracket that came off of a 87 S10 Blazer, those should work just fine for this mod right and as far as fuses for both the high and low beams two of those inline fuse holders is sufficient right?
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