As a general rule you can grind or cut off the end of the fastener that you can get to. While that allows you to remove the item it doesn't always solve the whole problem because that doesn't necessarily release the other end of the fastener. I can't offer detailed help because I'm not familiar with your light & don't have one in front of me to look at. Good luck.

Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.