I've always been a fluorescent ring light guy, and it's still is my preference, but when I added a 0.4x objective to my scope the increased working distance exceeded the power of my fluorescent light. In other words, not enough light was reaching my work. The Inverse-Square Law dictates that a small increase in distance between the light source and the subject equates to a huge reduction in the amount light hitting the subject.
The O.C. White Micro Lite ring light is a very high output LED that's dimmable. I've experimented with diffusers but haven't really found anything that works to suit me. In the mean time I've gotten used to it and it's performing well. What I don't like is the pinpoints of light that reflect back from polished metal which can be painfully bright.