I had the same on my 21. They over torqued the screws and split the receiving piece on the inside of the frame. Did the same on the bashguard and fittings. In all fairness they did replace the broken pieces but it took a couple of months.
You'll have to test the lamp yourself at 12v to check the draw. I believe I read it on here somewhere that the light ports once activated are good for 18w at 12v.
In the process of doing my own lights so can't confirm quite yet.
Best,
S