SEBI has issued a directive to standardize the lot sizes of FO.
Click at this photograph to see the enlarged image.
Till now lots sizes were decided by Exchanges but now they are fixed. SEBI will review this every 6 months.
Impact, it will be easier to plan for FOs now. For exapmle, if I want to invest in FO of RIL, I know without checking for any exchange that it will be a lot of 250 (in price range 801-1600).