Electrical

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The weekend is coming soon and I will need to go ang get some supplies soon, so some quick questions.

1). VHO- I have 4 VHO's on the system. I need to by two ballast and the seller said he buys them from the builder store. (Home Depot, etc.) the question is: What can y'all tell me about VHO lighting. I never used then before? And, do y'all get ya lighting from HD or where? VHO parts, endcaps, etc.? Should I mount the ballast and such under in stand are on back of canopy, what ...