My MK38 doesn't quite reach 500Kcd by my measurements but it's no slouch at 471Kcd. A big 145Kcd jump over my K30GTvn90 with more than triple the output. I know that Vinh mentioned that a donut might be visible with this model but I don't know what LED that's with. If there's any donut on my SFT40 version, I'm unable to see it. According to the light meter, the center yields the highest throw number. The K30GTvn90 has a rather obvious donut, for example. Very different lights, I know. It's just the "closest" popcan light I have for comparison.