To my understanding, Smart IR was renamed to Smart Supplement Light in the 4MP R6 series of Hikvision cameras.
Via a web browser - Configuration >> Image >> Display Settings >> Day/Night Switch
Cheers i see that i have the 4MP 2.8 turret i ahve 5 up in total and only one is giving me a good picture ar night mine are 2.8mm but some how i think i need a 4 or 6mm one as the ir seems two strong