Night Vision Camera Without Red Light: 850nm vs 940nm IR

A night vision camera without red light is a camera whose infrared LEDs work at around 940nm instead of the more common 850nm. The faint red dots you see on most cameras at night are the 850nm LEDs leaking a little visible light; 940nm LEDs are close to invisible, so nothing gives the camera's position away. The trade-off is range and brightness: the same camera sensor sees 940nm light less well, so the picture is usually darker and the usable night distance shorter. Covering or painting over the red LEDs does not give you a "no-glow" camera — it just blinds it.

This article explains where the red light comes from, how to tell which type you have, and how to choose between the two without losing the night picture you actually need.

Where the red light comes from

Most security cameras see in the dark the same way. A ring of small LEDs around the lens sends out infrared light, which human eyes cannot see, and the camera's sensor picks up the reflection and shows a black-and-white picture. For how this compares with colour night modes, see colour night vision versus infrared.

The catch is that "infrared" is not one single colour. LEDs are built to emit around a particular wavelength, and the two common choices for cameras behave differently:

• Around 850nm. This sits just past the edge of what people can see. The LEDs are not designed to give visible light, but a small part of their output spills over into deep red. Look straight at the camera in the dark and you see a dull red glow, usually as a ring of dots. Camera sensors are quite sensitive at this wavelength, so the light goes a long way.
• Around 940nm. This is further from visible light. In a dark room, most people see nothing at all, or at most a very faint glimmer if they stand close and look straight in. Camera sensors are noticeably less sensitive here, so more of the light is "wasted" and the picture is dimmer for the same LEDs.

So the red light is not a separate warning lamp or a status light. It is a side effect of the infrared itself. That is why it switches on at dusk and off at dawn together with the black-and-white picture.

Is the red light a problem?

For many homes it is not. A visible glow tells passers-by a camera is there, which some owners want. But there are real reasons to look for an invisible IR camera:

• Bedrooms, nurseries and living rooms. A red ring in the corner of a dark room can disturb sleep or bother children.
• Discreet coverage. You may not want the camera's exact position obvious at night, for example in a garden or a shed.
• Glow reflected nearby. In a small, dark room the red dots can show up on a shiny wall, mirror or headboard close to the camera.
• Wildlife. Some animals may react to the glow; others may not notice either type.

Before you change cameras, decide which of these actually applies to you. If your only complaint is a sleeping child, a simpler fix (below) may be enough.

How to tell which type your camera has

You do not need to open anything. Work through these checks in order.

1. Read the label or the manual for your model. The spec sheet often names the IR wavelength, or uses words like "no-glow", "invisible IR" or "low-glow". If it says 850nm, expect a visible red glow; if it says 940nm, expect little or none.
2. Look at the camera in real darkness. Turn off room lights, or wait until it is dark outside, and confirm in the app's live view that the picture has switched to black and white. Then look directly at the lens from a short distance. A clear red ring means 850nm.
3. No glow? Check with your phone. Point your phone's camera at the LEDs and watch the phone screen. Many phone cameras show infrared as a white or purple spot. The front (selfie) camera often shows it more clearly than the rear one, because some rear cameras filter infrared out.
4. Read the result.
   • Red glow to your eye and a bright spot on the phone: an 850nm camera working normally.
   • No glow to your eye, but a spot on the phone: a 940nm camera, or a low-glow design, working normally.
   • No glow to your eye and nothing on the phone, while the picture is black: the infrared is probably not switching on at all. That is a fault, not a "no-glow" feature — follow our guide to CCTV night vision problems.

Some cameras are sold as "low-glow". These often still use 850nm LEDs behind a darker cover, or run them more gently, so the glow is weaker but not gone. Check the spec sheet for your model to be sure.

What you give up with 940nm

With 940nm LEDs, three things usually change:

• Shorter night range. Because the sensor responds less to 940nm light, the edge of the picture falls into darkness sooner. As a worked example only: if an 850nm camera lights a driveway well to the gate, a 940nm version of the same camera may only light it well to the middle. The real figure depends on your model, so compare the stated night range on both spec sheets rather than trusting a rule of thumb.
• More grain. To make up for less light, the camera turns up its gain, and dark areas look noisier, especially on anything moving.
• Less detail at the edges. Faces and number plates near the far edge of the scene are harder to make out.

Indoors, in a normal room, these limits often do not matter: the distances are short and walls bounce light back. Outdoors, across a long yard or a car park, they matter a lot.

Do not cover the red LEDs

It is tempting to put tape over the red dots, paint the cover, or stick a dark film across the front. Here is what actually happens:

• Tape or paint blocks the infrared too. The red glow and the infrared come out of the same LEDs. Block one and you block the other, so the night picture goes dark.
• Film across the lens area causes glare. If the cover touches or sits near the lens window, infrared bounces back into the lens and the picture fills with a white haze.
• Partial covering gives an uneven picture. Cover some LEDs and one side of the image stays dark.

If you want to stop the glow in a room without losing all night vision, these are safer options:

1. Turn the built-in IR off in the app and use existing light. In the camera's settings, look for a night vision or IR setting (often called "Night Vision", "IR LED" or similar — names differ slightly by model and app version). Some models let you choose auto, always on or always off. With IR off, the camera relies on any light in the room, such as a nightlight. Check the picture in the live view afterwards; it may be too dark to be useful.
2. Switch to a colour or white-light mode, if your model has one. That swaps a red glow for a visible white light, which suits entrances rather than bedrooms.
3. Turn the camera so the LEDs do not face the bed. A small change of angle often removes the glow from the sleeper's line of sight while keeping the area covered.
4. Place a dim nightlight in the room and leave IR on auto. On some models, enough room light keeps the camera in its daytime or low-light mode so the IR never switches on. Whether this works depends on the camera's light threshold — test it over a whole night.

Adding a separate 940nm light instead

If you like your current camera but want the area lit without a visible glow, an external infrared lamp is another route. You can turn off or turn down the camera's own LEDs (where the model allows) and let a separate 940nm lamp, mounted away from the camera, light the scene.

Two cautions. First, the camera must be able to see 940nm light reasonably well, or the extra lamp adds little; test before you fix anything in place. Second, matching wavelength, beam angle and mounting position is a topic of its own, covered step by step in how to add an IR light for night vision. If you are mounting anything on a wall, a roof edge or a pole, switch off the power at the supply first, use a stable ladder with someone holding it, and have a qualified electrician do any mains wiring.

Choosing: 850nm or 940nm for each spot

Use this as a quick guide, then confirm against the spec sheet for the actual model.

• Bedroom, nursery, baby monitor: 940nm or a low-glow camera, at short range. The shorter range rarely matters indoors.
• Living room or hallway at home: either. If the red glow bothers no one, 850nm gives a brighter picture.
• Long back yard, field edge, car park: 850nm. You will usually want the extra reach and detail more than you want the camera hidden.
• Front door or porch: often a colour camera with existing porch light is the better answer than either infrared type.
• Discreet garden or shed coverage: 940nm if the area is small, or an 850nm camera placed where its glow is not in direct view.
• Behind a window: neither. Glass reflects infrared back into the lens, so the camera sees its own glare. Mount the camera outside, or turn its IR off and rely on outdoor lighting.

Tips to get the best from a no-glow camera

Because a 940nm camera has less light to work with, small details make a bigger difference:

1. Keep the scene close. Aim it at the area you actually need, not at the far horizon.
2. Clean the front cover. Dust and fingerprints scatter what little light there is and add haze.
3. Keep objects away from the lens. A wall edge, eave or plant close to the camera reflects infrared and makes the rest of the picture darker as the camera adjusts.
4. Use existing light where you can. A small outdoor light on a timer, or a street lamp in view, helps any night camera.
5. Test at real night, not dusk. Check the live view and a recorded clip at the darkest time you care about, and walk through the far edge of the scene to see whether you can recognise yourself.

If you notice the picture looking oddly tinted instead of grey, that is a different issue; see why some night vision images look green.

When to get help

Contact the seller or the support channel listed for your model if:

• The camera's description says no-glow or 940nm, but you see a bright red glow.
• The picture is completely black at night, and your phone camera shows no infrared light from the LEDs.
• The picture stays in colour at night and never switches to black and white, even in a fully dark room.
• The IR setting in the app has no effect, or the setting resets by itself.
• Part of the LED ring has stopped working, leaving one side of the picture dark.

Have your model name (from the label on the camera), the app version and a screenshot or short clip of the night picture ready. That speeds things up.

Frequently asked questions

Can I make my existing camera stop showing a red light?

Not by changing the LEDs, which are built into the camera. You can turn the infrared off in the app if your model allows it, change the camera's angle, or use room light so the IR does not switch on. Covering the LEDs blocks the infrared as well, so the night picture goes dark.

Is an invisible IR camera completely undetectable?

No. A 940nm camera is very hard to see by eye, but a phone camera pointed at it will often show the LEDs as a light spot, and the camera body itself is still visible. Think of it as discreet, not hidden. Check local rules before placing any camera where it could record neighbours or public areas.

Does a night vision camera without light work in total darkness?

Yes, if it uses infrared, whether 850nm or 940nm. The light it uses is simply invisible to you. A camera that only has a colour sensor and no infrared LEDs or spotlight cannot see in total darkness and needs some existing light.

Does the red light mean the camera is recording?

Not necessarily. The red glow only means the infrared LEDs are on, which happens whenever the camera is in night mode. Whether it is recording depends on your recording settings, such as continuous recording or motion-triggered recording, and on whether a memory card or cloud recording is set up.

Why does my camera glow red only some nights?

The camera switches infrared on when its light sensor decides it is dark enough. On nights with a bright moon, a nearby street light or a light left on indoors, it may stay in colour mode longer or not switch at all. If it switches back and forth repeatedly through the night, a light source near its threshold is the usual cause.