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We were once told by a representative of a supplier that CRI was how energy efficient a LED bulb was. I didn't believe it after checking the packaging of some bulbs, but I never looked into it any further. I checked this morning, and only one brand lists the CRI, and it's very high at 95.
One thing you should know about lumen: they've changed, at least in Europe, how they measure it a couple of years back. Before manufacturers could measure it any way they wanted to. So they measured it at the point where the bulb gives off most light. Iirc they now have to do multiple measures and average it. So a new LED light bulb of 600 lumen gives more light than the old incandescent bulbs of 60 watt, which were usually between 650 and 700 lumen.
Also, in Europe when the started phasing out the incandescent light bulb there were, and still are, some loopholes. Special bulbs were exempt. So they started selling those for regular incandescents. First they sold the reinforced ones, which gave about 10% less light than a regular bulb. That loophole was closed two years ago, now they sell 300 degree Celcius lightbulbs, mostly used in ovens, as normal ones and those give off even less light than the reinforced ones (LED doesn't like heat, so there's no alternative for these bulbs yet). Also, if they put on the box that the bulb is meant for outdoor lighting they are allowed, that's a trick the manufacturers of decorative bulbs use, which use 40 watt, but only give off 160 lumen (about 20 watt regular lightbulb).
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