That Knog Oi Bell is rubbish in terms of volume! I bought it purely for its beautiful design. Same with the lights - I was after a retro look. It’ll never be ridden at night as it’s just for summer daytime riding.
If you’re after a superb Bell then the Spurcycle Bell is amazing. It’s fitted to my hybrid and I’ve posted pictures of it in another thread somewhere - just search my posts to find it. The Spurcycle Bell also looks great, but has one of the loudest Bell sounds too.
I did get the front light off eBay but had to buy the mount separately. The only technically good part on the bike is the saddle and the rear light.