Then what about FOC jets? Isn't the IAF supposed to induct 40 Tejas mk1? How many of these are LSP and how many are IOC/FOC?
SP are IOC jets for now. LSP was when Tejas was in dveelopment, it needed trials and hence prototype were made.
The definition of SP is "Serial Production" which is the production version to be handed to IAF. LSP means "Limited Serial Production" only emant for developmental activity and not handed to IAF.
FOC jets also will be SP jets. 16 SP jets are IOC & 16 are FOC while another 8 SP are trainer. LSP jets are excusively for testing and trials captive to HAL. So, any trial or test of equipment will e done in LSP before using in SP versions as IOC/FOC/MK1A planes. Tejas has 16 prototypes till now (in addition to 16SP planes in IOC specs). This includes PV, Naval and LSP planes