Which part of the spectrum do the goggles prefer?

The preferred part of the spectrum for night vision goggles is near infrared (near IR). Night vision technology typically enhances visibility in low-light conditions by utilizing the near-infrared range, which is just beyond the visible spectrum. This range allows night vision devices to detect and amplify ambient light that is otherwise imperceptible to the human eye, including starlight and light from the moon.

By focusing on near IR, these goggles can provide a clearer image in darkness without requiring a strong light source, making them particularly effective for nighttime operations. The near IR light can be naturally emitted or reflected by objects in the environment, making it an ideal choice for enhancing visual capability in limited light scenarios.

While visible light can be detected, its use is limited in complete darkness, and far infrared is more suited for thermal imaging, which detects heat rather than ambient light. Ultraviolet light falls outside of the effective range for night vision technology, as it is not commonly available in nighttime conditions. Thus, near infrared stands out as the optimal choice for night vision goggles to maximize visibility during nighttime or low-light operations.