why don't try this web for DIY everything you need to get and to know how to do it is there
Commercial lights fixtures never gonna last longer that DIY if you do it right it is not that expensive but is better.
Imagine commercial led fixture last more than 10 years 12 hours a day they will go bankrupt
Check this web :
http://reefledlights.com/
For good led fixture you have 2 option DIY led lights and save about the half of $ or buy commercial and pay fortune