Personally I'd say don't get too hung up on brightness. As I said, I came from the world of 200 lumen (nominal) lights and assumed I'd always want whatever I had running on high.

In reality, medium mode on my P7 is almost always plenty. I only flip to high on a part of my route where I'm going down descents on rough gravel roads that are sometimes potholed and almost always washboarded. On those parts, I want to see 50 feet or more ahead, to steer around washboarded sections. On paved road, medium is plenty, and in the rural areas on paved roads, low is actually fine too.

Yes, you want a nice bright light, but the P7 puts out enough that in many situations, you won't need all of it.