Here's an interesting, low-cost alternative. Start with the fact that photo lights and boxes have two characteristics: the light is at a certain temperature, and the boxes diffuse the light. Today, with the develop of LED bulbs, you can find LEDs in the same temperature as photo flashes (I bought a whole box of generic, correct-temperature LED floodlights at Costco). And since these bulbs don't get hot, simple gauze-type cloth can be used as a diffuser as long as it's at least a few inches from the bulbs.
I have an old track light that holds three of the bulbs, and I shopped garage sales for a couple of light fixtures on arms -- the type of light used on desks or drafting boards (remember those?) -- which gives me side or back lighting that enhances the visibility of 3D shapes.
Background? I prefer a curved surface (i.e., no seam or hard corners); so cloth from a bolt can be used. Or, Home Depot carries a flexible white plastic wall board (4' x 8' sheet) with a lightly pebbled side. Cut it with a box cutter knife if it's too big. Clip it to the edge of a table and to something to hold up the back. Roll it up (loosely) when you're done. Spray paint it if you want more matt finish or a different color. This setup can clearly handle fairly large items.
Are your items highly color sensitive? Many cameras and software programs (e.g., Photoshop) have white-balance settings. Put something white in the photo area, adjust the camera setting, then starting taking pictures of your items.
Hope this helps!
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Greg Moss
Museum Planning Committee
International Society of Antique Scale Collectors (www.isasc.org)
Pittsburgh, PA
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