Good grief, I hope Smoke Sara does you good on this. I have been told to stick with Mars Hydros and so I did buy 1 400W and then ordered two more 400W to have three for three plants. If these lights will have problems, that is not going to be good. Even if they fix them for you, what about the time wasted once your plants are work in process.
If you are worried about a light going down the $60 eBay 60 X 5 is cheap insurance