I found a website for "ALZO" floodlights; this company boasts a new 'cool light' that they claim is better for studio digital photography than flash. However, the prices are outrageous. A three light set up with softboxes for $2,000 to $5,000. Is there any truth to their claim, and if so, are there alternatives to THEIR products? I find it hard to believe they've developed a floodlight that is so superior to any other.
I believe the point Kevin was trying to make is that continuous lighting has to be VERY bright to enable small aperture or high shutter speed at ISO 100... And that while continuous lighting does not limit your shutter in terms of sync speed, it may limit your overall power capabilities. It is much more difficult from a technical and power standpoint to achieve a constant output level than a strobed output level. You're not going to find a cheap option to give constant light at small aperture, fast shutter, and low ISO for a large subject.
Even if you get hot lights that have the power to shoot at f/16, ISO 100, 1/100sec, your model may get a bit squinty, just as he/she would on a sunny day staring at the sun.
Kevin also seems to be referring to the fact that flash duration can be MUCH shorter than shutter duration, allowing a photographer to stop motion with the strobe light in situations in which it would be impossible to do so with the shutter. For instance, my AB1600 at full power has a flash duration of a mere 1/1800sec. Thus, I can stop motion with the flash at that speed rather than being limited by my shutter, which can be rendered almost irrelevant in this case if the flash is powerful enough relative to the ambient light.
So even though the sync limit on most cameras limits the available shutter speed, strobes often offer better motion-stopping options than hotlights.
The only proviso to what Kevin is saying is that studio strobes typically have a shorter duration at full power than at lower power-levels. This is counter-intuitive, but you can see this from the specs of many manufacturers. For instance, my AB1600's flash duration lengthens to 1/900sec at 1/32 power. Strange, but true.
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