Gunner,
Those lights are designed to update old style high bay lights, generally hung more like double the 14' you are talking about. How high will these lights be mounted? Those are designed to be hung from the ceiling as they need cooling. Generally have lots of failures due to heat as that design doesn't cool well. Good ones of that style are fine and I've used them but never lower than 24' lamp height. Unless your design is very different than what I'm thinking, you won't be happy. You said 14' tall building. Does that mean 14' walls with a peak in the middle that is much higher than 14'?
People think those lights are bright because they are very irritating to look AT. Don't confuse that with putting out a bunch of light. Don't confuse high color temp like 6500K with bright either because those are irritating to look AT.