I've never used it but the F&V R-300 ring light seems to get some good reviews both on and off lens.

I have the F&V lights they are small compact and work out great. Highly recommended.

I have the F&V 300 and I like the light it produces. One thing I don't like is that there's no obvious way to adjust the angle, so it's always at 90% to the floor. The only way I have of changing this that I know is using a few adapters together that add to the weight and trouble. The actual adaptor that is provided with the light is is bulky and unnecessarily so (unless you use it on a camera instead of a lightstand, which I don't), and yet it uses nonstandard threads so you'll have to DIY it if you want to change that out.