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Studio flash" equipment that runs off of 110 volt A.C. wall current has come a long way in the last 10,15 years. The new thing is portable power, with powerful, high-capacity batteries fitted with pure sine wave inverters, from companies like Innovatronix, and also Paul C. Buff company, with its much smaller and lighter Vagabond line of very portable battery and sine wave power supplies. These have changes studio flash into
anywhere flash equipment.
Can you do good work with just one light? YES! Last night I attended a 90-minute lecture and demonstration on using just one flash. For one segment, the presenter used a large PVC scrim with three layers of diffusion on it, a 4x4 foot foam board reflector, and a lightweight,white fabric backdrop, and made really nice images using just a single, bare-tube Speedotron 103 flash head to light both the fabric to perfect white, and to create beautiful, large catchlights in the eyes.
Flash can be battery-powered, like your new 600, or "studio" flash, which has a constant modeling lamp in it, to show where the light is headed, and to aid in focusing the camera. The inexpensive monolights available today make getting into this a $100-$150 point of entry. I recommend the
Adorama Flashpoint 320M to people who want to buy a monolight, and learn how to use it. I prefer studio flash units for the way they can easily accept parabolic reflectors and honeycomb grids, and mylar diffusers, as well as two-way barndoors. Plus, umbrellas, softboxes, beauty dishes, and so on. These so-called
light modifiers, or light shaping tools, are what studio lights were designed to readily accept, and they can use larger, bigger, more-capable versions of these things than speedlights can use.
There are a lot of ways to light things. Many,many ways. Using one or two lights, or using multiple lights with modifiers. You probably want some type of lighting bible to get you started. I'd start with the on-line Strobist site, and Neil V's on-line blong, Tangents, and progress from there, where you will learn the most basic terms and practices, and then buy Light,Science,Magic or whatever the exact title is after you've gotten some of the basics down on your own.