Unfortunately, the native software turns off the radar if you have the light setting off. The manual says when light is in standby mode (device on but light setting off) then it will NOT detect vehicles. Although maybe this new firmware update will allow it, I have not installed it yet.
As far as I remember, if the radar is set to Individual in Light Network Settings, I can toggle the light off with the Varia's button but the radar will still work. I found this rather confusing since the manual, as you stated, suggests this is a stand by mode for both light and radar.
@5789130 As mentioned by Ewarnerusa, the Smart Bike Lights app is very useful but can be a bit much to wrap your head around setting it up. However, once you've got it, its a great app.
I've got it set to allow for a Smart Mode, where the radar is off while riding, but on a vehicle approach the radar will blink.
Replying to myself here, but I thought I'd report my results as I've finally done the FW update to my Varia. Now when the light mode is manually set to off, the radar still functions but it does not trigger the main light alert on the Varia. It does show radar activity on the Edge. I suppose this is the intended behavior to comply with the countries that don't allow a flashing light.
