Nonstandard obstruction lights must provide equal intensity in all angles using air-approved light assemblies.

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Multiple Choice

Nonstandard obstruction lights must provide equal intensity in all angles using air-approved light assemblies.

The key idea here is that obstruction lights must be seen from every direction. Even when an obstruction uses a nonstandard fixture, its purpose is to warn aircraft no matter which way they approach, so it has to deliver the same brightness in all angles. Using air-approved light assemblies ensures that the fixture has been tested and certified to meet the required photometric performance, including uniform angular distribution. If the light were brighter from some directions and dimmer from others, pilots could miss it on approaches where the intensity is lower, defeating the safety purpose. This uniform, omnidirectional visibility is required so the obstruction remains conspicuous at night and in low-visibility conditions, not just during daylight.

The key idea here is that obstruction lights must be seen from every direction. Even when an obstruction uses a nonstandard fixture, its purpose is to warn aircraft no matter which way they approach, so it has to deliver the same brightness in all angles. Using air-approved light assemblies ensures that the fixture has been tested and certified to meet the required photometric performance, including uniform angular distribution. If the light were brighter from some directions and dimmer from others, pilots could miss it on approaches where the intensity is lower, defeating the safety purpose. This uniform, omnidirectional visibility is required so the obstruction remains conspicuous at night and in low-visibility conditions, not just during daylight.

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