Good way to test CRI?

Not once you get optics and driver losses involved. Also the Philips bulbs put out the most light of any MR16. It’s the only one that can replace a 50W halogen bulb. Doing lots of light in the MR16 form factor is a real challenge. The Philips bulbs actually contain a tiny fan. And it has real, confirmed specs and UL/CSA/FCC certifications. I tested LOTS of bulbs before settling on the Philips bulbs (search My adventures in LED home lighting for “Philips”)