#222LED -Red A Red Bulb 222LED replacement is for night vision. Miniature Lamp, E10 Base Style MS Mini screw Led equivalent 2.2v, .25amp. This #222LED Red miniature light bulb is for night vision, as your eyes are less sensitive to the red light wavelength, the military has used red light to read maps for decades to preserve their night vision. This LED red magnifier bulb will give you a more less subdued light then the incandescent version,