Hey.. This is regarding the calibration of cinema projector. What should be the nit level for a DCI p3 cinema grading projector. As I know the the dci p3 should be 48 nits. So is this the standard for colouring suits. Can you please suggest a low budget range projectors for P3 and rec709 both individually. (If I can't afford a p3 one I will go for rec709) . thank you..

Yes, 48 nits is the correct level for any digital cinema projector for SDR imagery.
And no, we cannot suggest any specific low-budget projectors.
(They just don't exists for professional use.)

Steve