1. It varies by location, there seems to be more night fish in the Atlantic than the Pacific. One spot in NJ we usually do at night because less boat traffic, less students stiring up the bottom and a better chance of finding seahorses. :)
2. A group of us from DB do encourage new divers to join us on the above dive. It’s a good intro to night diving and NJ’s limited vis. Because of the lights it’s actually easier to keep track of your buddy. Night diving is not dark with everyone wearing marker lights and using lights brighter than your cars headlamps!
3. Me no but for someone shopping for lights it would be great to compare lights in water.