Scopes do not gather light. This is a constant misnomer that is spat about.
Scopes transmit light...lens coatings and exit pupil are the likely biggest factors in low light performance.
The human eye can only dilate to about 5mm..and that is when youngest and/or healthiest.
This scope will provide you an exit pupil of 3.2mm at 10 power, or 64% of the max of a human eye.
At 3X and lower, the scope will provide the most light.
These PST line of scopes have great coatings and boast high 90s percent light transmission.
So...in conclusion...this scope will provide you plenty of useable light as configured.