Jewelry Photography Tips: Part #1 Lights (photofloods)

Lights (photofloods) The kind of lights and lighting that I recommend for our drop shadow system are photofloods (type B). You can buy these bulbs at many photo stores but you should shop around: prices vary from 2 dollars to 10 dollars per bulb. They are a pretty standard item in photo stores that sell to professionals. Tell the camera store staff you will be using tungsten film.
They are mounted in clamp - on lights, such as you might find at a hardware store, where there's a spun aluminum bell and a little clamp - on part to the light socket. The best quality ones have ceramic sockets, so you should try and find ones with ceramic sockets if at all possible. The plastic socket kind can overheat, their switches tend to wear out and they are usually not rated for the high wattage used in photoflood bulbs - which makes them both dangerous and probably illegal in the event of a fire.
We will use three main light sources for our system: two 250 watt bulbs and one 500 watt bulb. The 500 watt one is above the shooting surface and the 250 watt ones are above and on the sides. I recommend buying at least four of the 250 watt bulbs and three of the 500 watt bulbs and having that many on hand most of the time. It can be very frustrating to burn out your last bulb in the middle of an important photo shoot and not have a replacement on hand. We will be using three lights for our system and that will serve us very well most of the time. When you handle and change the bulbs use a clean cloth like a handkerchief or cotton gloves like they sell in camera stores. Grease traces on the bulb can apparently sometimes contribute to bulb failure (note that if you ever change halogen slide projector bulbs you should treat them the same way).
Remember to shut off any other sources of light when you are shooting as incandescent bulbs or fluorescent bulbs nearby can affect the colors you get in your photographs. Tungsten films do not react well to other types of lights being on at the same time when you take photographs with them.

Full article here: http://usjol.com:80/news/issue3/tips_p1.html
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