Here is another simple setup that is close to the Scott Kelby one listed above, but a little easier to set up and requires less gear.
Use whatever lights you would normally use to light your model or product plus this neat little background setup:
1 light stand,
1 boom, reflector holder or background pole kit,
1 diffuser, and
1 (or more) light to shoot through the diffuser – I have only ever needed one light
Below is a diagram showing a traditional seamless white background setup and one showing this simple version. After that are a couple different shots showing some results.
You can get a great head-shot on a white background with two lights, a reflector and a diffuser! I have several different diffusers (actually 5-in-1 reflectors): 22” diam., 42” diam., and 42” x 72” rectangular. This last one is a little heavy so when using that I usually clip it to a background pole setup.
All Images © chris martin photography