Dale, Where do you buy these in the US?
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I have been very lucky in getting new or like new by trolling eBay, but I have purchased some components from lab/tech suppliers who specialize in research equipment. One can often buy certain bundles new as surplus on eBay and save a great deal. Some of this stuff is kind of pricey if ordered new from the dealers. (I paid nearly 2K to my dealer for a darkfield L.E.D. illuminator [not fiber optic] from Schott/Leica.)
Currently I have five or six fiber optic light sources which are the model DCR III or Ace II models. I got them for some microscopic work I do with my Leica MZ12 microscopes, but then as I collected many different types of fiber optic bundles, the other photo application opportunities became obvious to me. The bundles I have range from round, flexible 2mm diameter to over 10mm in both ridged and flexible up to 10 feet long with focusing lenses at the terminus; ring lights of various sizes; and some back-light diffused panels. Depending on configuration these can be very bright and I often use them on relatively low settings. Some of these items are designed for use in machine vision, etc.
To be honest, when I replied to Kyle's original post I was thinking he meant small still-life scenes (product shots, etc.) where these can be useful, but then later realized that he's likely working on something larger than I was envisioning. Still, these are quite useful in certain instances, especially close-up or macro applications or smallish still life scenes. They're nice to work with because they're cool.
If you'd like a couple of links to illustrate the models I use I'd be happy to find them. Schott has an online catalogue, and there are regional dealers.
Dale