I personaly wouldnt worry about it, If you know how to DIY
a lighting setup then troubleshooting and reparing a fixture shouldnt be too though IMHO
If your conserned about not knowing how to open the thing and fix it.. then by all means cancel the order..
I would not suggest this brand to someone that didnt have an understanding of how these things work.. sending it back for a repacement while your reef is in the dark is just not exceptable IMHO
. I would have some spare ballasts ready and waiting on these things..