There are only two times when I cross in front of a car, (1) is at a four way stop sign and then I often wave the car through so that I can cross behind them and (2) the car has to stop and I do not but if it is night and they already came to a stop they would be more in front of me than to my side so my forward beam is more likely to be seen.

I do not think any dyno powered lights will put out enough side light to make you more visible from the side than you would be with reflective tire sidewalls, reflectors attached to spokes, etc. In this case a battery powered headlamp attached to your helmet might be the most effective option, presumably you are looking at them as you ride past.

I think all dyno powered lights have a water ingress problem if mounted where it can collect tire spray. I have a couple different B&M lights and a Spaninga taillight, they all have small holes at the base of the light. I have an AXA Luxx 70 Plus headlamp that I thought was worse than average for water sealing at the USB port. And I am not very happy with the light beam, at this time I am not using that light.

The Luxos U and B have a couple bolts that penetrate the top of the housing, I have not removed them so I do not know if there is any seal there but I suspect there is not. On a different forum, someone commented that the Luxos U lacked water sealing at the four spade connectors on back.

I have not had my IQ-XS out in rain, but I think that one looks pretty good from a water sealing perspective as long as you do not have tire spray on the bottom or back of it. It has a small plastic fitting on the mount, but the plastic looks pretty robust. There is a new IQ-XS that does not have a metal housing, all of my comments on the IQ-XS are based on the two that I own that have the aluminum housing.

The only time I have any flickering on any of my lights is at very slow speed, like pedaling up a steep hill, and at that low speed and low hub output I am not surprised at flickering considering it is an AC circuit.