Datasheet

Here's the gain's available:

VL6180X_ALS_GAIN_1 - gain of 1x

VL6180X_ALS_GAIN_1_25 - gain of 1.25x

VL6180X_ALS_GAIN_1_67 - gain of 1.67x

VL6180X_ALS_GAIN_2_5 - gain of 2.5x

VL6180X_ALS_GAIN_5 - gain of 5x

VL6180X_ALS_GAIN_10 - gain of 10x

VL6180X_ALS_GAIN_20 - gain of 20x

VL6180X_ALS_GAIN_40 - gain of 40x

We suggest starting with a gain of 5x and then adjusting up or down as necessary

https://learn.adafruit.com/adafruit-vl6180x-time-of-flight-micro-lidar-

distance-sensor-breakout

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