Try to find a spot that has a mercury light that illuminates the water like on a dock. Fish will normally be going there to feed at night and you will have more success. Also, if you don't see a ball of bait around your light after 30 min or so, your probably in the wrong spot. The fish are coming to feed and if there's not a lot of bait they won't be coming.
I fish allot at night in the summer using Green lights. It can be very good when you can attract bait and fish. However, if fish are not normally in that spot you won't be successful just dropping it in a single night. If you owned or rented a dock or slip you can change that by putting the light on a timer. Once you attract baitfish, the bigger fish will eventually come. This won't help you if you are just dropping a green light somewhere the fish are not normally at.
Keep track of the moon phases. Full moon is best for night fishing.
John 21:3 Simon Peter saith unto them, I go a fishing. They say unto him, We also go with thee.