What unique light-producing capability allows some documented dragonfish to illuminate prey without alerting them?

The capability to produce red light from photophores near their eyes

A truly extraordinary adaptation observed in certain dragonfish documented in North American waters is their specialized ability to produce red light using photophores situated near their eyes. This is highly advantageous because the vast majority of deep-sea creatures cannot perceive or detect red wavelengths of light. Consequently, the dragonfish can deploy this red light as a covert searchlight. This mechanism allows the predator to effectively illuminate potential prey and assess its surroundings without signaling its own presence to organisms that rely on blue-light vision, providing a significant predatory advantage in the perpetual darkness of the deep sea.