'light gathering' is a correct and usable phrase in written English.
It is generally used to refer to the concentration of light by a device, such as a telescope lens or a solar panel. For example, "The telescope lens was expertly designed to maximize the light gathering capabilities."
That should result in a.5 factor gain in light gathering ability for the lens, adding to the iPhone's low-light abilities.
This paper uses numerical modeling to analyze fiber bundle array configurations and fiber numerical apertures to determine their light gathering efficiency and sample size as a function of probe-to-sample distance.
Optimization of the angle-of-incidence in conjunction with the specially developed lens maximizes light gathering efficiency extending to the perimeter of the sensor for a sharper image with exceptional clarity.
The size of this primary lens is the main factor in determining the light gathering ability and resolution of a refracting telescope.
The FluorChem E & M imager is a digital darkroom technology with an 8.3 megapixel CCD (charge-coupled device) resolution and flat field calibration that corrects for non-uniformities in light gathering.
In a digital camera, light gathering and storage are divorced.
The backlit sensor is a highly efficient light-gathering instrument that produces very little noise at high sensitivity levels particularly in low light settings.
This latter figure is a measure of the light-gathering power of the instrument.
The images are poor, but the light-gathering power is enormous.
It thus had the light-gathering power of a single 450-cm (176-inch) telescope.
The most important of all the powers of an optical telescope is its light-gathering power.
