Replace your puny flashlight with a proper floodlight.
This mod replaces your default helmet flashlight with a much broader light source. This new flashlight covers not only the full visible screen area in 1st-person view (depending on the distance, of course), it also has about 25% more range than before, i.e. as far as the engine allows. See pictures for examples.
The mod will ignore any flashlight texture replacer which you may have installed.
NPCs (e.g. Spacers) will also use the same light.
When the environment is very foggy, the light will of course also light the fog, in these cases it may get brighter than you like (see foggy example picture).