Incorrect max value for Medium Light Mask Pass Tweet

[sudisk]

On the environment tab, the default medium light pass mask value is 2^24-1=4194303, but the Slider/Input box only allows values up to 100000.

Could the maximum value of the field be increased so that we can specify a correct value for the mask value ?

Besides, could anyone explain how the light pass mask works with light ids, or confirm that the leftmost (high) bit corresponds to the light id 1?