No watermarks or any obvious break, I hooked it backup after winter storage powered up and no light not sure if it was last fall that it failed or this year as it is difficult to tell its working except at night when you can see a glow at the end of the unit if on. I am concerned about the replacement lamp burning out if it is caused by some other reason such as the transformer or possible other causes? Interesting that the replacement lamps are twice as much in Ontario Canada then the USA.