Since I mentioned I had the 352 LED Ring light, I've had a few questions about it. So before walking out the door I took a few pics of what diffusion would look like with the LED ring light and compared it against the popular Z96 LED. This is not a test of color temperature, this is just a test on diffusion of the ring light. Settings on the camera were at 1/80th F/4 ISO 640. Keeping these settings, you can see how much more or less light there is compared to each other.
As a standard I first started out with the Z96 about 3 feet away from the subject. The subject (Yoda) was about 3ft. away from the white background. You can see the coverage of the light in the full image. In the closeup photo, you can see how much shadow the light casts along with how much diffusion there is around the face.
Next is the 352 LED Ring light. I have this light powered up from my 12v battery that came with the 183 LED light. Besides outputting much brighter light, you can see how much more area of coverage this light has over the Z96. The light is also very well diffused around the face with soft shadows that wrap around the subject.
So how well does this light work? It works great, but it requires an AC outlet or 12V battery pack. Even though this ring light is dimmable, it's a very bright source of light that might be uncomfortable for your subject to stare at directly. If you're not working with people then it's a great LED ring that provides very soft even lighting. So to be fair, this should be considered more of an option to the 500 LED panel over an on-camera LED light (even though it can be an on-camera light).
The light itself is extremely light-weight made mostly of plastic. There is an OFF/ON switch as well as a dimmer knob. There are no filters provided with this ring light. If it's too bright for your subject, you could put it off to the side with a light stand. Carry a few and it can serve as a portable lighting kit great for traveling interviews. The options already built in to run on AC power or through a 12V power source make it more flexible than a 500 LED without added cost (batteries not included). This would easily run on a portable jumper battery with built in Cigarette lighter adapter (like the one I have). Long lasting 12V rechargeables are easy to come by. You can even use the batteries from 'Power Wheels' kids electric cars found at Toys-R-Us.
Considering the price. The 352 LED Ring light is about the same price as the popular 500 LED panels. The Ring light also cannot produce the same amount of brightness as the 500 LED panel, but if weight and size is a concern, this Ring Light cuts that inconvenience down to half. Besides being smaller and lighter than a 500 LED, it can be mounted with your camera for mobile use (something you can't do with a 500 LED). Price might seem high when comparing LED count, but for some traveling types it might justify the cost. You can pack several of these into Airplane carry on luggage as opposed to one single 500 LED light panel.
352 LED Ring Light with 12V input AC Adapter for Video