Hi!!
I did SL a while ago.
It has no lighter day in its novice routine.
Search the stronglifts site for an intermediate routine, but remember, the faster linear progress in strenght is achieved with the beginer routine, once you stall, deload and rebuild (3 times if needed), reduce to 5x3,3x3 and 3x1 (if needed i never got to low, neither i consider should anyone as the weights will most likely produce injury), any is valid and has a specific time to be put into practice. Also check the site to know when.
I believe it is intended to progress for an intermediate somewhere between squating 100 to 140kg. If you seach the site you will find the other lifts goals for intermediate, i can give it on pm as i do not have them right now.
Oh and by the way, the novice routine burned me out so bad, everytime i squated over 60kg i got a major headwick. Looking back i should have SD at some point, wich is a component the program does not incorporate and it will be invaluable if you are to progress further.
Hope i helped