[Alan] acquired a stereo microscope from eBay, and decided to save some more money by designing, machining, and assembling his own
arc reactor ring light to go along. After finding an LED driver board sitting around as well as ordering some surface mount LEDs, he set about using a lathe to cut away a block of lexan, making sure to include slots for the lights as well as the microscope mount point. Follow the link to see the detailed build photos, as well as some comparison shots with and without the ring light.
A month or two earlier though, and [Alan] would have had a fantastic start to an Iron Man costume.