Discussion
In a workshop environment with large machines and obstructions, the preferred scheme of lighting is:
Answer: A
In a workshop with large machines and obstructions, direct lighting from a few fittings would cast sharp shadows behind the machines and give glare. Indirect lighting sends the light to the ceiling and walls, from which it is reflected, so it is soft, spread out and nearly shadow free, which is what the key gives as the preferred scheme, option (A). Direct lighting is the one that casts shadows, and optical lighting is not a standard scheme; diffusing systems still send much light downward.
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