Haley! Welcome to Basenotes!
Just wanted to let everyone know this is a very close friend of mine. We've known eachother for a many years. I've been sending her fragrances and samples that I think she'd like, but my wardrobe has been catered to my own personal tastes, so it's not the easiest task.
Its not exactly light, but Chergui is a wonderful night time / romantic fragrance. I'll send a sample. There are also quite a few fragrances in the Bond #9 line that are light, but suitable for night time romantic use. Claire de Musc by Serge Lutens is a light musc fragrance that can be worn anytime, and can be wonderful at night.
Light generally isn't mutually exclusive with romantic and night, but they are out there. Light isn't really my forte, so hopefully the wonderful basenotes community will be able to help.