NCIDQ IDFX Practice Exam

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What are the brightness ratios recommended for tasks?

2:1, 4:1, 8:1
3:1, 5:1, 10:1
1:1, 6:1, 12:1
3:1, 5:1, 20:1

The correct answer is: 3:1, 5:1, 10:1

The recommended brightness ratios for tasks are important in ensuring that the lighting is adequate for various activities, enhancing visual comfort and performance. The use of specific ratios helps achieve the necessary contrast between different surfaces or within visual fields, facilitating better visibility and reducing eye strain. The option stating ratios of 3:1, 5:1, and 10:1 aligns well with industry standards for task lighting. These levels are determined based on the type of tasks being performed and the inherent visual demands of those activities. For instance, a 3:1 ratio could be suitable for general office work, while a 5:1 ratio may be recommended for activities requiring a bit more visual discrimination, such as reading detailed text. The 10:1 ratio is typically reserved for more critical tasks that require fine detail and high levels of concentration, such as drafting or intricate assembly work. These ratios support the visual performance requirements by ensuring sufficient contrast and illumination levels, which helps in reducing fatigue and maintains productivity over long working periods.