Another popular type of light used in photography is the floodlight. These lights can produce a partially diffused, soft light, which is similar to the sunlight on an overcast day. To diffuse the light, a frosted globe is placed over the flashtube. It is then diffused more by a reflector that forces the rays of light to cross and interfere with each other. However, the light rays from the front of the flash tube are crisper as they aren't as diffused.
The light from an electronic flash floodlight is generally crisper at the center and softer at the edges. If you want to use the soft part of the light you can use a technique called feathering which means you only let the outer part of the beam fall on the subject. If you want the whole light to be soft and diffused you should use a diffusing screen.
Floodlights are often used in portraits when a softer effect is required. They are also used as fill lights as fill lights are always diffused.
Floodlights are available in various sizes, colors and power. They can range in price from about $100 to over $2,000