The intention is to learn the concept of ナイトプール (which is somewhat different from night pools). While not all of them have the characteristic pink/purple lighting, since it rarely if ever appears with just the base model only, it is the focus of this LoRA. It's likely that this could be done with just clever prompting.
The current version is rather inconsistent and mostly just adds a pink hue to the scene. You might have to roll quite a few times to get the water to be pink. Also, orb-shaped lights often show up unprompted, since apparently those are common in these pools.