The minimum ignition-related construction measurement for lamp illumination is five foot-candles. Which option matches this requirement?

• A. 3 foot-candles
• B. 5 foot-candles
• C. 7 foot-candles
• D. 9 foot-candles

Answer: (B)

Foot-candles measure illuminance on a surface and are used to set minimum lighting levels in safety-related construction work. The ignition-related construction requirement specifies a minimum of five foot-candles. Therefore, the value that matches this requirement is five foot-candles. Three foot-candles is below the minimum and would not meet safety standards; seven and nine foot-candles are higher than the minimum, but they do not represent the required minimum itself.