Cons of using speedlights for product photography: low power output and more
Of course, though it is definitely possible to produce high quality images for product photography with speedlights alone, they aren’t perfect. Much as I value them, and don’t like to focus on negatives, there are a few factors that prevent off-camera flashes from being ideal all-rounders.
One is simply that a speedlight is a less powerful than a strobe light. While strobes usually start at around 500W, speedlights typically only offer a tenth of that at 50W. Sometimes, when you’re shooting products, you just need more power.
While being battery-powered makes speedlights very mobile, batteries do inevitably run down. This is a big deal for product photographers.
Aside from being a source of worry, it means that after an extended spell of shooting, your speedlights may begin losing power. At that point, it’s no longer possible to create images with your camera without first charging the flashes back up.