Question about XGIMI Horizon Pro

Hello everyone... Under the specs of the XGIMI Horizon Pro it says: 2200 ANSI Lumen. According to the manufacturer, this projector has 1500 ISO lumens. The same applies to the XGIMI Horizon. The two lumen values cannot be compared directly, but 1500 ISO lumens is significantly less than 2200 ANSI lumens. For comparison: The specs of the XGIMI Horizon Ultra (CH) state 2300 ANSI lumens. According to the manufacturer, it is 2300 ISO lumens. Can you check the specifications so that it is a bit clearer? Thank you very much!