IMO, 'light sparring' is sparring that is done at a measured pace, with engagement defined and controlled by the parties involved. In our dojo, light sparring is often done without protective gear, the idea is no one is going to get bloodied up even if they miss a block or walk into a punch. Often done with newer students where the senior partner simply throws slow easy punches to get the newer student to get used to moving, blocking, deflecting, etc; speed is added as the confidence level rises. Sometimes it's a give-and-take between two more evenly-matched students, but again, at a measured pace with no intent to show off, hurt, etc. Just basic working techniques. If one gets tagged, they might say "do that again, slowly, show me how you did that," and so on. It's a partnership, not a contest.
Now, despite mister kyu belt knowing more than me and disliking my suggestions, I am going to repeat one last time that an uppercut is faster than a straight punch if the uppercut lands and the straight punch does not. Speed is relative to effect, my fine young cannibal, whether you like it or not. If I'm not there when your straight punch lands, but my uppercut creases your jaw, I win, and my punch was faster because it actually *was* a punch.
Regarding uppercuts. An Isshinryu uppercut is a straight punch anyway, as I also said. Yes, I'm aware that there are many kinds of uppercuts. I don't know how everyone does theirs, I just know how we do ours, and trust me, it's as straight as an arrow; it just comes up at an angle. There's no boxer's curve on it. Yes, we use our hips. We use our hips for just about everything. But of course, people with no knowledge of our system are free to tell me how wrong I am about it - getting a lot of that today, so what the heck, bring it.
Not entirely sure why mister hatey mc hatington is unhappy with my posts, seeing as he asked a question and I tried my best to answer it, but I'll give it one more chance before he goes onto my ignore list.
Have a good day, everyone. I'm heading off to the dojo. To, you know, actually train.