Dyson laser head and particle sensor explained

What the laser head does

The laser head is a soft roller cleaner head, sometimes called a Fluffy head, with a light built into the front. The light projects a thin, flat beam across the floor at a very low angle. Because the beam skims the surface, even small specks of dust and fine hair cast a visible shadow or catch the light, so you can see dust that is invisible under room lighting.

On the V15 Detect and V12 Detect Slim, Dyson calls this the Laser Slim Fluffy head, and it uses a green light. On the Gen5 Detect, Dyson's lit soft roller head is called the Fluffy Optic. The light does not clean anything by itself. It shows you where dust is, so you clean more thoroughly and stop going over areas that are already clean.

Which Dyson head for hard floors?

For hard floors such as wood, laminate, vinyl and tiles, the soft roller head is the right choice on a V15, V12 or Gen5. Its soft nylon and carbon fibre roller picks up fine dust and larger debris such as cereal together, and it is gentle on polished surfaces. The lit version adds the visibility benefit on the same head.

The motorised heads with stiffer bristles are designed for carpet and rugs. They work on hard floors too, but they can scatter larger debris and do not pick up fine dust as well as the soft roller on smooth floors. If your home is mostly hard floors, our hard floor vacuum guide covers the best options, and our Dyson cleaner heads guide explains each head.

How the particle sensor works

Inside the machine, air carrying dust passes a piezo sensor. When particles strike it, it produces tiny electrical signals, which the machine uses to count the particles and sort them by size. The V15 Detect Animal listing describes it as a piezo sensor that continuously sizes and counts dust particles and automatically increases suction power when needed. That is why it is sometimes called an acoustic particle counter.

The LCD screen shows the counts, usually as a bar graph by particle size, alongside the power mode and remaining runtime. In Auto mode, the machine raises suction when the sensor detects more dust and lowers it when the floor is cleaner, which helps save battery on lightly soiled areas. The counts are an indicator of what is being picked up, not a laboratory measurement of how clean your floor is.

Which models have which Detect features

All three Detect families have the particle sensor and screen. The lit soft roller head is included with many editions, but not all. For example, the V15 Detect Animal listing we use includes the High Torque head and Hair screw tool and does not list the laser head. Check the box contents before you buy if the lit head matters to you.

• V15 Detect: particle sensor, LCD screen, Laser Slim Fluffy head on many editions, High Torque head with de-tangling comb, around 2021
• V12 Detect Slim: particle sensor, LCD screen, Laser Slim Fluffy head on Absolute editions, lighter body and smaller bin, UK around 2022
• Gen5 Detect: particle sensor, LCD screen, Fluffy Optic lit head in most UK bundles, push button control, around 2024

Compare Dyson's Detect models →

Where the Detect features help, and where they do not

The lit head helps most on hard floors in rooms with fine dust: kitchens, hallways and bedrooms with wooden floors. It shows dust along skirting boards and under furniture that you would otherwise miss, and it shows when an area is already clean so you can move on. It helps less on patterned tiles in bright daylight and not at all on carpet, where the soft roller is the wrong head anyway.

The particle sensor helps by adjusting power automatically in Auto mode and by giving feedback on the screen. It does not change what the floor head can physically pick up, so a well chosen head matters more than the sensor. If you clean mostly carpets, the motorised head and its Auto mode give more benefit than the lit head.

Gen5 Detect: what is new

We do not summarise third party reviews of the Gen5 Detect, but the facts Dyson has published are clear. Dyson quotes 280 AW of suction and up to 70 minutes of runtime, and the Gen5 uses a push button instead of a trigger. It keeps the particle sensor and LCD screen, uses a lit soft roller head called the Fluffy Optic, and Dyson describes its filtration as sealed HEPA.

If you are deciding between the Gen5 and a discounted V15, the Detect features are broadly similar on both, so the choice comes down to suction, runtime, controls and price. Our Gen5 vs V15 comparison covers that decision.

Note:Before cleaning a soft roller or removing a head, switch the machine off and remove the battery where your model allows it. Let washed rollers and filters dry fully, for at least 24 hours or as your manual says, before refitting.

Frequently asked questions

What is the laser on the Dyson V15 for? It lights up fine dust on hard floors by shining a flat beam across the surface at a low angle, so you can see and pick up dust you would otherwise miss. It does not clean on its own.

Which Dyson V15 head should I use on hard floors? Use the soft roller head, ideally the lit Laser Slim Fluffy if your edition has it. The motorised heads are designed mainly for carpet.

Can I use the laser head on carpet? It is not designed for carpet. Use the motorised head on carpet and rugs, where its bristles and Auto mode do the work.

Is the particle count on the screen accurate? It is an indicator of the dust passing through the machine, sorted by size bands. Treat it as useful feedback rather than a precise measurement of how clean your home is.