Medium-intensity flashing white lights are not recommended for structures less than how many feet above ground level?

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Multiple Choice

Medium-intensity flashing white lights are not recommended for structures less than how many feet above ground level?

Medium-intensity flashing white obstruction lights are specified for structures tall enough to be a noticeable air obstacle, but not so tall that the highest-intensity lighting is required. The standard guideline is that these lights are not recommended for structures below 150 feet above ground level. Above about 200 feet, higher-intensity lighting is typically used. So the height threshold for using medium-intensity lights starts at 150 feet, not 200 feet.

Medium-intensity flashing white obstruction lights are specified for structures tall enough to be a noticeable air obstacle, but not so tall that the highest-intensity lighting is required. The standard guideline is that these lights are not recommended for structures below 150 feet above ground level. Above about 200 feet, higher-intensity lighting is typically used. So the height threshold for using medium-intensity lights starts at 150 feet, not 200 feet.

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