The big disadvantage in using larger light sources is that the larger the source, the less texture that source tends to create, and texture is a very important part of photography. The smaller light source tends to create itty bitty shadows across a surface, where the larger source tends to automatically fill in the shadows. The best way to create texture in the studio is to "scrape" light across the desired surface. The smaller the light, the more texture you end up with. (given the same amount of fill) The more texture you get, the more drama you create. And drama is usually a good thing in photography.
(tangent subject – one of the tough things you will find in professional photography is translating your clients words into the photographic image. Drama is one of those words. Drama usually translates to using a small light, without much fill light, and at a harsh angle so that much of the subject is in shadow.)
Another nice thing about using small lights, is that you can intentionally cast shadows across the image (as in the background of the image supplied above.)
The down-side to using small light sources, is the really crisp shadows that the small light casts onto the surface you are shooting on or across some of the other objects in the picture. The cast shadows across other objects can be avoided by adjusting the composition or by possible selecting another position for the light. With a little experimentation, you will find that these shadows can be minimized by using reflectors (or mirrors) to bounce light into just the shadow areas.
So? if your goal is to create as much texture as possible, try using a small light source in place of the big freaken box you usually use. And if you screw up and your client hates it, give them my number. :o)
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