222 Red Bulb for Magnifiers, #222-Red For Night Vision Bulbs 222 Replacement Miniature Lamp, 2.2v, .25amp. This #222 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 incandescent red magnifier bulb will give you a more subdued light then the LED version, because of its lower wavelength and calvin rating. This red bulb model will fit many of our Electro-Optix models, including our popular M-7series, M-70, MP-8, MP-10,MP-12, MP-14, TM-7, TM-8, our reticle magnifiers and our Nitewriter Pens. Also fits eschenbach models, 1571,1572,1573,1575 and some Bausch & Lomb lighted pocket magnifiers. Each purchase is for 1 Bulb POWER: 2.22 Volt, .25 Amp Base Style-MS Mini Screw E10 Base Red Magnifier Bulb for Night Vision