Get a small (not powerful, legal) industrial laser pointer with a little holder / mount you can aim. This one was about $60 on ebay. Find the light sensitive sensor on the streetlight and aim it on that. It will take 20 seconds or so then it should disable for a few minutes. If you keep the laser trained onto the sensor, it will stay off all night.
This is the one I used but I had to change the lens on the laser to a point instead of a “level” line.
Post time: 05-26-2017