they shouldnt be staying on.
one way to test this is to get vastly out of range of the pir so you arent triggering it and look at the camera through your phone as if you were going to take a picture of the camera. in looking at IR through a camera you can see their signature much more clear if they are on.
test it on a V2 if you have one. take a picture of a v2 wth the nightvision IR on nd another with the IR night vision off…you will see what im talking about
for instance, i found this picture on the outerwebz. this guy appears to have IR leds on his hat…so looking through the camera you can see it as your phone would see t on the left vs as you would see it with your eye on the right.
this is one way to see if your IR leds are staying on.