I have been trying buy photo light bulbs locally but was shocked
at the prices. A 250 bulb from a photo supply shop costs US $150.
to $200. As I need three according to Amy O'Connell's site advice I
am unable to buy them due to this excessive cost.
I don't know Amy O'Connell's site. But here is what I would do:
1) Buy ordinary household bulbs, 75 - 100 watts, but make sure they
are all new and of the same kind and strength. Don't mix with old
ones. (Halogens will also work)
2) On your camera, adjust your white balance to automatic
3) Use white background.
4) Use tripod (or other sturdy fixture)
5) Use long exposure and small aperture.
6) Use the timer on your camera (3 or 10 seconds)
7) Experiment until you are satisfied.
F.Y.I., The colour temperature of these bulbs is around 3000-3500
Kelvin. If you want coloured and/or textured background, you should
add that in Photoshop.
The 250 bulbs you mentioned, are expensive because they are
calibrated for colour-film.
Since you are shooting with a digital camera, you don't need them.
Besides, 3x250w is a bit overkill for a small set-up.