I would be very leery of depending on this much uplighting. Most of the reason being, the interior steel in your building will, over time, become dirty, much more so than you realize, and you will not be able to clean it effectively, if and when you realize that it needs it. These fixtures wii collect dirt on the upper lenses or optics and require regular cleanings to keep them effective.
These lights look like they would be great in an office or school environment where its reasonably clean, and indirect lighting would work effectively. Don't get me wrong, some uplighting is desirable to prevent the "cave effect" that results from 100% downlighting and no reflected light off the ceiling. My metal halides have up to about 30% uplighting, but also have full exposure of the bulb downward. On these they only expose a small amount of the bulb to downward lighting and even that is diffused. You are totally dependent on the uplighting effect. You would, of course, have to hang them well down from the ceiling so as to take advantage of the uplight.
Edit: looking at the CL ad again, you are looking at the bottom of the light, I suspect the fixtures do not have upper lenses included as they do not show them.
Here are the lighting optics options.
Here is the light distribution for what appears to be the CL ad fixtures, full open top and some downlight.
And here is the lighting distribution for the same fixture with downlight ONLY.
Here is the lighting distribution with the center bulb downlight only and the outer two uplight only.
Nice looking fixtures however.
Just my two cents worth, and I am NOT a lighting expert.
Charles
