CCTV & Surveillance
CCTV Night Vision Not Working? Blurry, White or Dark Footage Fixes
Why CCTV footage turns white, blurry or dark at night and how to fix it: IR reflection, spider webs, dirty domes, failing IR, weak power and day/night settings.
By Giga Team Solutions · · 7 min read
A camera that gives a clean picture by day but a white haze, a dark smear or a flickering image at night is one of the most common CCTV complaints. Most causes are physical and cost little to fix: something near the lens is reflecting the camera's own infrared light, the glass is dirty, or the power supply cannot cope once the infrared lights switch on. This guide goes through each cause in the order a technician would check them.
How night vision works, and a quick diagnosis
At dusk a standard camera moves its IR-cut filter aside, switches to black-and-white and lights the scene with infrared (IR) LEDs that people cannot see. So anything close to the lens is lit far more brightly than the scene, the camera draws more current at night, and the picture fades to dark beyond the IR range on its datasheet. Most faults follow from those three facts.
| Symptom at night | Most likely cause | First thing to try |
|---|---|---|
| Whole image white or milky | IR reflecting off glass, an eave or a nearby wall | Re-aim or move the camera; never point an IR camera through a window |
| Bright glare in one part of the frame | Wall, gutter, pole or signboard close to the lens | Tilt so the object is out of view |
| Glowing strands and constant motion alerts | Spider webs or insects on the camera | Clear webs and clean the housing |
| Soft and blurry at night, sharp by day | Dirty or scratched dome, or IR focus shift | Clean the glass; refocus a varifocal camera at night |
| Dark beyond a few metres | IR LEDs failing, or the scene is beyond the IR range | Check the LEDs; add lighting |
| Camera reboots, flickers or goes black at dusk | Undersized power supply or voltage drop on the cable | Measure the voltage at the camera after dark |
| Pink colours by day, or never switches to night mode | Day/night setting, or a stuck IR-cut filter | Check the day/night mode; replace the camera if the filter is stuck |
White or washed-out footage: IR reflection
- Behind glass. An IR camera inside a shop or house looking out through a window sees its own IR bounce straight back off the glass. Mount the camera outside, or switch its IR off and rely on outside lighting.
- Tight under the eaves. A camera tucked under a roof overhang often has the eave or fascia board in the top of the frame. The IR lights it up and the rest of the picture darkens to compensate. Mount lower or tilt down until the eave is out of view.
- Dome cameras. A foam or rubber ring inside the dome separates the IR LEDs from the lens. If it shifts or is left out after servicing, IR leaks inside the bubble and causes haze.
Many cameras also have Smart IR in the image settings. It lowers IR power when something comes close, so a face at the gate is not burnt out to white. If your camera has it, turn it on.
Blurry footage: dirt, webs and focus
- Spider webs. IR LEDs attract insects at night, and spiders follow. A strand in front of the lens glows, blurs the picture and triggers motion alerts as it moves. Brush webs away regularly.
- Dust and rain spots. Dust from murram roads and dried rain marks scatter IR light. Clean the glass with a soft microfibre cloth, slightly damp with clean water if needed. Avoid harsh chemicals and paper towels, which scratch the bubble, and scratches scatter IR permanently.
- IR focus shift. Some lower-cost lenses bring visible light and infrared light into focus at slightly different points, so a camera focused in daylight goes soft after dark. On a varifocal camera, set the focus after dark or choose a setting that works acceptably for both.
- Condensation. Misting inside the housing means a failed seal; the camera usually needs replacing.
Dark footage: failing IR or weak power
At night, most IR cameras show a faint red glow around the lens. Some use "no-glow" IR that is invisible, so check the datasheet before assuming the LEDs are dead. If there is no glow and the picture is black beyond a metre or two, the IR board has probably failed through age, heat or water. On most cameras a replacement costs less than a repair.
Power is the other big cause. If the supply was sized for daytime load, or the cable run is long and thin, the voltage at the camera sags once the IR comes on. Typical signs are a camera that reboots at dusk, flickering IR, or lines rolling across the picture.
- Find the maximum power or current for each camera on its label or datasheet (the figure with IR on).
- Add them up for every camera on that supply, and leave headroom. A common rule is not to load a supply beyond about 80% of its rating.
- After dark, measure the voltage at the camera end of the cable with a multimeter. If it is well below 12V, use a larger supply, shorter or thicker cable, or a separate supply for distant cameras.
A 12V 3A power supply unit (KSh 1,800) suits a small number of cameras within its rating. Unstable mains during KPLC outages and surges also kill cheap adaptors, which is why our UPS guide for CCTV recommends backup power for the whole system.
Day/night settings
- Mode. The day/night setting should normally be Auto. If someone has set it to Day, the IR never switches on.
- Sensitivity and delay. A camera near a security light or streetlight can sit right on the switching threshold and flip between colour and black-and-white, often with an audible click from the filter. Lower the sensitivity, increase the switching delay, or use a schedule.
- Stuck IR-cut filter. Pink or purple daytime colours mean the filter is stuck open; a hazy night picture that stays in colour means it is stuck closed. This is mechanical, and the camera usually needs replacing.
- Gain. Too much brightness or gain fills the night picture with noise, which also makes recordings larger. Our CCTV hard disk calculator helps you estimate this.
When a full-colour (ColorVu) camera makes more sense
Hikvision's ColorVu cameras use a wide-aperture lens and a warm white light instead of IR, so they keep recording in colour at night. Colour helps when you need to describe clothing or a vehicle afterwards. Our Hikvision ColorVu 1080p (KSh 3,400) is an affordable way to try this at a gate or shopfront.
There are trade-offs. The white light attracts insects, so webs still need clearing, and it can shine into a neighbour's windows. Aim it at your own property: Kenyan privacy rulings on cameras that capture neighbours are covered in our CCTV law guide. For wide, dark areas such as a long perimeter, a standard IR camera or added outdoor lighting may still be the better fit. Our guide on how to choose a CCTV camera compares the options.
Frequently Asked Questions
Why is my CCTV footage white at night?
Almost always IR reflection. The camera's infrared light is bouncing back off a window, an eave, a nearby wall or a dirty dome. Re-aim or move the camera and clean the glass.
Why does my camera work by day but go off at night?
The IR LEDs draw more current after dark, and a weak or overloaded power supply cannot keep up. Measure the voltage at the camera at night and upgrade the supply if it drops.
Can I clean the camera dome with water?
Yes, with a soft microfibre cloth slightly damp with clean water. Avoid paper towels and strong cleaners, which scratch the dome and make IR glare worse.
Do ColorVu cameras have night vision?
They see at night using a wide-aperture lens and a white light rather than infrared, so the footage stays in colour. The light can be controlled in the camera settings on many models.
For cameras, power supplies and parts, see our CCTV range or visit the shop at White Angle House, Rm 62, Kenneth Matiba Rd, Nairobi CBD (Mon–Sat, 8:00 AM – 6:00 PM). Delivery is a flat KSh 300 anywhere in Kenya, with cash on delivery. If a camera still misbehaves after these checks, WhatsApp +254 718 811 661 with a screenshot of the night footage.
