Just had a look in one of me books and found a little more about the make up. There were Sikhs, Dogras, Pathans and Punjabi Mohammadans. Still nothing on the relative amounts, though. So two more turban types to research if you fancy getting out the old putty.

Another interesting fact is that they weren't Lancers when they set out, they were merely the 9th Bengal Cavalry. They were required to convert to lancers and retrain while en route to Bombay to take ship. So they may not have been as effective as your normal lancers are in whatever rules you use.