Attachable light to see potholes in the dark?

Looking for something I might have seen on kickstarter a while back but search is turning up only plain light attachments. I'm looking for a light that projects a grid onto the pavement ahead, and when the lines of light dip, that's how you see the pothole.

I have, like, street-legal lights on front & back, and I don't want a brighter light that could bother oncoming drivers. The light I'm describing is less invasive than the products I'm seeing.

Thanks.