i don't go heavy but i do them with STRICT form and i take about 4 seconds to
complete each rep.
i am primarily a slow twitch composition and i never grew with heavy weight
and lower reps. i got strong as hell and somewhat bulky.
be careful and don't let your knees travel past your feet. pre exhaust with leg
press or even extensions ( but don't lock out ) there is a 62 year old trainer
( 100% natural! ) with a true 500 lb squat at a gym i train at in birmingham!
Yes, lightweights have their appeal...but I love the weights bro...I love to pump heavy weights ololo