A Varifocal Starlight Bullet is going to become available shortly, it supports external Alarm Input so if you want to hook a physical motion sensor directly up to it you can.. performance will be identical to the Varifocal Turret. IPC-HFW5231E-Z | Dahua Technology
There is a 16mm Varifocal Bullet in 6MP thats better than all the 3/4/8MP Cameras with its IMX178, its not low enough lux for dahua to call it a starlight.. but its roughly as good in low light as a decent non-starlight 1080p, but at 6MP.. its really the ONLY UHD camera that even does well in low light conditions right now, but it price is over $300 a piece so its not for for the faint of heart and its still not close to the performance of the 2MP Starlights (0.02 Lux vs 0.006 Lux): IPC-HFW8630E-Z | Dahua Technology. I think its a good candidate for LPR use, it is a case where more pixels and less noise can really help automatic plate reading, and because plates are very well litup at night.
Found one place selling the bullet for $199, not too bad, I'd prefer to throw Adam the business though for being an awesome dude to the community.