Optic 6 or 8

Grow from Home
1

Hi all thanks to all on led light info
I have narrowed it down to getting the Optic 6 or 8
Can’t wrap my head around they say the 8 will cost me less electricity then the 6
I have a 4x4 tent
The cost difference is about $400
Does the 6 fully cover 4x4 in flower
Any help with making my choice greatly appreciated
I am pretty new grower
Once again thanks to all
This Buds for you