Final answer:
A minimum of 5 foot-candles is required for painting or working at night in order to meet the minimum illuminance requirement.
Step-by-step explanation:
In order to meet the minimum illuminance requirement while painting or working at night, a minimum of 5 foot-candles is required. Foot-candle is a unit of illuminance that measures the amount of light falling on a surface. It is equivalent to one lumen per square foot. This requirement ensures visibility and safety in low light conditions.
For example, if you have a lighting fixture that provides 10 foot-candles of illuminance, it means that there are 10 lumens of light falling on every square foot of the surface being illuminated.
To put this into context, the Occupational Safety and Health Administration (OSHA) recommends a minimum illuminance of 50 foot-candles for fine mechanical work and 5 foot-candles for general office lighting.