Wait, disregarding light transmission losses, if depth of field is the same, that means the same cone of light is focused on the same % area of the sensor, therefore the same total amount of light is gathered. BUT in terms of sensor area sensitive to light, a bigger sensor will generally have less relative space taken up by supporting circuitry and therfore make a better use of that available light(assuming same resolution)
Wait, disregarding light transmission losses, if depth of field is the same, that means the same cone of light is focused on the same % area of the sensor, therefore the same total amount of light is gathered. BUT in terms of sensor area sensitive to light, a bigger sensor will generally have less relative space taken up by supporting circuitry and therfore make a better use of that available light(assuming same resolution)