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I don't find lumens to be a good metric by which to judge a light designed for daytime visibility. Neither the Varia nor the Bontrager Flare/Ion RT lights are rated for many lumens, yet they are all extremely visible in even full daylight. What seems to matter is how the light is focused - and all of these do that very well.
I will add that I also consider a front-facing daytime flashing light to be essential. My couple of closest calls over the years have been when oncoming traffic decides to pass another oncoming vehicle, coming into my lane head-on. The front-flashing light really seems to minimize that - and the Ion RT is tiny and very effective during daylight. However I've tried to get home with it as a headlight once or twice after dark, and it was worthless for night visibility!
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