Rigel Systems Infralite Switchable 2-White/2-Infrared LED Flashlight with Battery

For use with Night Vision Scopes and Cameras. Switchable between 2 White and 2 Infra-Red LEDs. The intensity is fully adjustable with Thumbwheel Brightness Control.

Preserving night vision is distinct from visual acuity. If all one is doing is picking up an eyepiece, checking some equipment, walking around, glancing at a control, any task that doesn't require high visual acuity, then adjustable brightness red light is best for preserving night vision.

If one wishes to read fine details that requires visual acuity, that requires using one's fovea which are packed with cones (color sensitive retinal cells), then adjustable brightness white is a perfect choice for sharper vision and shows colored markings on charts correctly.