the Led´s in the dummy plugs are not really usefull for everybody. they do the only job to show me if there is a card damaged.
for the reason that it is very cold and drafty in the room and that i´m very sluggardly i decide to install the led´s
because so i can see without open the glass door between the rooms that every card is ok. if there is a card doing not enought hashes i need only restart the miner by remote and to 98% the led will not light if the card is damages after the miner has restart.