Security Camera Night Vision Explained: Infrared (IR) vs Colour Night Vision
Quick answer: Infrared (IR) night vision records sharp black-and-white video in total darkness and works in every conditions. Colour night vision keeps colours visible at night using large-aperture sensors and built-in spotlights, which helps identify clothing and vehicles. Most homes get the best result from a camera that combines both modes.
How does night vision work on a security camera?
At dusk the camera removes its IR-cut filter and switches the image sensor to low-light mode. From that point the picture depends on two things: how much light the sensor can gather and whether the camera adds its own light. IR cameras illuminate the scene with invisible infrared LEDs. Colour night vision cameras use very sensitive sensors with wide apertures (typically f/1.0-f/1.6) and, when needed, a white LED spotlight.
What is infrared (IR) night vision?
IR night vision uses infrared LEDs, usually 850 nm, that are invisible to the human eye. The camera sees the reflected IR light and produces a black-and-white image.
- Works in total darkness – no street lighting needed
- Discreet – the scene is not lit visibly, only a faint red glow of the LEDs
- Long range – typical IR range is 30 m, professional models reach 50-60 m
- Limitation – footage is monochrome, so colours of clothing or cars cannot be identified
What is colour night vision?
Colour night vision keeps the image in colour after dark. It relies on a large sensor and wide aperture, and many models add a spotlight that switches on when motion is detected.
- Colours remain visible – clothing, vehicles and number plates are easier to identify
- Deterrence – a spotlight that turns on tells an intruder they have been seen
- Needs some light – moonlight, a yard lamp or the built-in spotlight
- Limitation – in absolute darkness without the spotlight, quality drops below IR
IR vs colour night vision: comparison
| Feature | Infrared (IR) | Colour night vision |
|---|---|---|
| Image at night | Black and white | Full colour |
| Works in total darkness | Yes | Only with spotlight |
| Identification of colours | No | Yes |
| Discreet operation | Yes | No when spotlight is on |
| Deterrent effect | Low | High |
| Typical use | Perimeters, warehouses, dark yards | Entrances, driveways, front doors |
Which one should you choose?
- Dark rural property or warehouse: IR – it works with zero ambient light. See PoE cameras.
- Front door or driveway: colour night vision with spotlight for identification and deterrence.
- Remote sites without power: battery and 4G / Wi-Fi cameras increasingly offer both modes.
- Whole-property coverage: combine both in a surveillance camera kit – IR for the perimeter, colour for entry points.
Modern Reolink cameras with ColorX / Full-Colour technology handle both duties in one device.
Frequently asked questions
Can a camera have both IR and colour night vision?
Yes. Many current models use IR in total darkness and switch to colour when there is enough light or when the spotlight activates.
How far does IR night vision reach?
Consumer cameras typically reach about 30 m; professional and EXIR models reach 50-60 m or more.
Does colour night vision work without any light?
No. It needs at least a small amount of ambient light or the built-in spotlight. In absolute darkness the camera falls back to IR or spotlight mode.
Which is better against burglars?
Colour night vision with an automatic spotlight has the stronger deterrent effect, while IR provides covert continuous recording. The strongest setup uses both.
