Lighting terminology and these any good?

[Jason McK]

Ya HO and PC are the same thing.
Now if they are good or not depends on what you want to keep in you aquarium and how big it is. I used two of these units when I first started and I would say they are good for Soft corals like Mushrooms / Zoos / Leathers and fish of course. If you wanted anything else in the tank I would really consider MH or at least VHO

J