Light Discipline During Conflict

Different light sources are visible at vastly different distances, making them tactical liabilities. A phone screen is visible up to 1 km away in darkness, a candle through a window is visible 2+ km away, and vehicle headlights can be spotted 10 km or more away. A standard flashlight beam is visible several kilometers depending on power. Any visible light attracts looters, hostile forces, or tracking individuals.

Block all interior light from being visible outside using heavy materials. Use thick blankets, tarps, or black plastic sheeting to cover windows and gaps, securing edges tightly with tape or weights so light cannot leak around edges. Overlap layers if possible. Test your blackout by going outside at night and checking for any light leakage. Pay special attention to cracks under doors, ventilation grates, and window frames—even small gaps are visible at distance.

Incomplete blackout is worse than no lighting at all—it trains hostile attention on your location. Seal every gap completely.

Red light preserves your night vision while remaining nearly invisible beyond close range. Use red headlamps, red flashlights, or red filters over white lights for navigation and tasks. Red light does not trigger the light-sensitive cone cells in human eyes the way white or blue light does, allowing you to see in darkness for extended periods. Red light is visible only 30-50 meters away compared to white light visible kilometers away, making it tactically safer for movement.

Blue light is the most visible color at distance and should be eliminated entirely in hostile conditions. Phone screens and LED indicators emit blue wavelengths that are highly visible—keep devices off or with screen brightness set to minimum, and cover devices with dark cloth if you must use them. Place black tape over LED indicators on chargers, electronics, and equipment. Store all blue-light devices in bags or containers during darkness to prevent accidental activation.

Cook during daylight hours whenever possible to avoid fire visibility. If cooking at night is necessary, use small, low fires enclosed in improvised barriers or stone rings that shield flames below the horizon line. Burning materials that produce less smoke and glow (hardwood vs. green wood) reduces your signature. Allow fires to burn down to coals for cooking rather than maintaining bright flames. Extinguish fires completely before darkness arrives or move to a location where fires cannot be seen from outside your shelter.

In hostile areas, drive without headlights using only parking lights if movement is necessary and only when absolutely required. Tape over interior dome lights so they do not illuminate when doors open. Keep all vehicle windows covered or partially lowered to reduce reflections and light leakage. Inside shelters, keep interior lights off and move using red light only, or navigate without light if you have time to allow your eyes to adjust to darkness. Minimize all light use during hours of darkness.