What is an ATON light that has equal periods of on and off called?

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Multiple Choice

What is an ATON light that has equal periods of on and off called?

Explanation:
ATON lights use different timing patterns to convey information. When the light is on and off for equal lengths of time, that pattern is called isophase. The on and off durations are the same, giving a steady, regular rhythm that mariners can recognize at a distance. This differs from occulting, where the light is on most of the time with brief interruptions, from flashing, where brief light pulses are repeated with longer dark intervals, and from fixed, which means a continuous, unchanging light. So the pattern with equal on and off periods is isophase.

ATON lights use different timing patterns to convey information. When the light is on and off for equal lengths of time, that pattern is called isophase. The on and off durations are the same, giving a steady, regular rhythm that mariners can recognize at a distance. This differs from occulting, where the light is on most of the time with brief interruptions, from flashing, where brief light pulses are repeated with longer dark intervals, and from fixed, which means a continuous, unchanging light. So the pattern with equal on and off periods is isophase.

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