Ok I understand the difference in grounding and bonding... And everywhere I read it all says NOT to connect the bonding system to the grounding system of your house... But, the NEC requires a #8 insulated wire be run in the light conduit to the deck box... This wire gets tied into the grounding system of your house.... On the light niche there is a lug to which this wire connects.... On the outside of the niche is another lug that the bonding wire connects to.... BUT, these 2 connections are tied together with a small metal plate.... So now, if everything metal is bonded together it is now grounded through your house grounding system... Right? And if so... Why is it such a big deal if people run it to, say, the ground rod of the house?