All dahua cams are in the 850 wavelength, but as mentioned it can see the 940 but would need a lot more. And you will still get the red glow if you looked directly at it.
At 30 feet the onboard IR is more than enough to make a plate pop.
At night, we have to run a very fast shutter speed (1/2,000) and in B/W with IR and the image will be black. All you will see are head/tail lights and the plate. Some people can get away with color if they have enough street lights, but most of us cannot. Here is a representative sample of plates I get at night with a 1/2,000 shutter and 8 FPS of vehicles traveling about 45MPH at 175 feet from my Z12E that is on the 2nd story soffit with no street lights. Camera is 35 feet above street at this location.
At 30 feet, the plate would be even more visible.
Also, keep in mind for LPR, it is all about making the plate as large as possible, so a 2.8 or 3.6mm camera will not work. At 30 feet you need a varifocal set to 12-13mm to be able able to read plates. Your field of view should be not much larger than a car.