Here’s the problem with going high. If you aren’t actually getting DOMS in your biceps, and I’m not getting them with 140lb preacher curls, you aren’t even using your biceps. They won’t grow. Period.
Even if it’s a little bit of weight, your biceps will grow. Of course, you actually have to increase the weight as you get bigger. But starting low and doing high reps will work, as long as your biceps are squeezing. You just need to keep increasing until you can’t.
If you work with too high weight, your forearms, etc. will do the bulk of the work, maybe all of it.