IF your day is 14 hours or more light it is unlikely they will bloom, some do. Most will need to see less hours of light and more hours of dark, can be 13/11 or may need 12/12 depending on genetics. Once the light cycle is short enuf flowering will start, the diet will change and if she has what she needs she should make lots of fat flowers. My outdoor is over for this year, its to cold out.
Moonlight is of no concern, the hours of light changing each day is expected by the plant, street lights would need to be very close to be any issue.
IMHO your just costing your self more money for the grow with the LED.