How should adequate environmental lighting be assessed during VT?

How should adequate environmental lighting be assessed during VT?

• A. By visual inspection only.
• B. Use a light meter to confirm uniform lighting and minimal glare.
• C. Lighting is not important.
• D. With a single fixed lamp.

Answer: (B)

Adequate environmental lighting in visual testing rests on seeing surface details clearly and consistently. The best approach is to measure lighting with a light meter, confirming that the area has uniform illuminance and minimal glare. A light meter provides objective data, letting you verify that all zones meet the needed level and that there aren’t hotspots or shadows that could hide or mimic defects. If the readings show nonuniformity or glare, you can reposition fixtures, add diffusers, or use indirect lighting to achieve even, glare-free illumination. Relying on visual impression alone is subjective, and using a single fixed lamp is unlikely to deliver the even lighting required for reliable VT results.

Adequate environmental lighting in visual testing rests on seeing surface details clearly and consistently. The best approach is to measure lighting with a light meter, confirming that the area has uniform illuminance and minimal glare. A light meter provides objective data, letting you verify that all zones meet the needed level and that there aren’t hotspots or shadows that could hide or mimic defects. If the readings show nonuniformity or glare, you can reposition fixtures, add diffusers, or use indirect lighting to achieve even, glare-free illumination. Relying on visual impression alone is subjective, and using a single fixed lamp is unlikely to deliver the even lighting required for reliable VT results.