Balloons are actually pretty hard to pop, especially when not inflated with air. I don’t think they’d work that well. You need something fragile that breaks on impact. There’s a reason a lot of hand grenades meant to break and distribute their payload were made from glass or ceramic. I would guess that light bulbs are probably the easiest and cheapest way to get bulbs for this.
Balloons are actually pretty hard to pop, especially when not inflated with air. I don’t think they’d work that well. You need something fragile that breaks on impact. There’s a reason a lot of hand grenades meant to break and distribute their payload were made from glass or ceramic. I would guess that light bulbs are probably the easiest and cheapest way to get bulbs for this.
Water balloons are surely designed to pop and spray their contents. That’s their whole point. Are you thinking of normal party balloons?