That remind me of my first DIY setup, though i just had 1 IR emitter,,,,,, A 10 Watt one that i could / can focus, just one downside it is a heavy SOB light source.
But back then camera image sensors was not so sensitive so you needed a lot of light thrown out there
If anyone are interested a good low light sensor today ( found in many a dashcam ) is the Sony IMX 291 ( 1080p sensor ) a 1440p alternative could be the IMX 335 now also found in a lot of dashcams.
Back then i used SD resolution sensors, also Sony but ones called effio - e
Hope you dont mind the thread flex.
Some old scope cam using a camcorder, i shoot a green airsoft pellet on 12 M or so ( 2012 ) , and then old night time shooting testing my first DIY rig on 20 M or so, thats filmed a couple of years later.https://youtu.be/MXiz_33EvHk
https://youtu.be/O_Nq7fLhGi8