I only learnt about day time light usage this year. Initially I was using my 600 lumen light on flash but then read here about how annoying bright flashing lights were and that it was bad cycling etiquette. I did notice some looks from other cyclists and pedestrians. So I switched to a cheap front light as my day time running light. Nowhere as powerful. I have it on fast flash and pointed straight ahead. I checked it out by walking about 25-30 yards away and I could see it blinking. So I figure it's adequate. But what if it's due to the bias of knowing to look for a blinking light?

At night, I keep my front and back lights on solid and have tiny silicone wrapped blinky lights on my helmet.