You need to have lightburn in mm mode when entering these values because they are metric. Then you can toggle units as you wish. also, 1m/s on the card is 1000mm/sec in the settings.
If you do not have these values or need to recalibrate them see here: Scanning Offset Value Generation Procedure.
Here is another take on it from the House of Lasers:
And here is more detail on how the units of measure can affect scanning offset values: