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Captions:

Often questions arise concerning the illumination of exterior areas of the spacecraft not reached by direct sunlight.

One might expect the side away from the sun to be dark but light reflected from the Earth or "Earth shine" provides ample illumination.

As the sun sets the external EVA lights are turned on to provide area lighting.

True, there is no light scattering or diffusing in the vacuum of space but there are cross reflections from the spacecraft surfaces and from the suit.

Astronauts have worked effectively in a wide variety of lighting conditions but ample artificial illumination is required for equal EVA work when the spacecraft is on the night side of the Earth.

Captions (continued):

For Space Station, lighting should be provided for all exterior areas of the vehicle. One of the worst lighting situations is encountered when facing the direct glare of the sun.