The Laser in a Laser Fog Lamp Only Works in the Mode You Should Not Use in Fog: Reading the Box Before Fog Season (India 2026)

Short answer: on the "laser" fog lamps we sell, the laser part only helps the high beam. Our own product listings say so. In fog you should be on low beam, so the feature you paid extra for does nothing in the weather the lamp is named after. If fog is why you are shopping, judge the lamp on its low beam: how flat and sharp the cutoff is, how wide the spread is, and how low it is mounted. The word "laser" tells you nothing about any of those.

Fog season is about to start across North India, and the shopping question shifts from "which one is brightest" to "which one works in fog". Those are different questions, and the laser label answers only the first. Here is how to read the box before you pay for it.

What our own listings say the laser does

We went back through every AES listing in our catalogue with "laser" in the name and read what each one says the laser actually does. These are the descriptions we publish, written from the supplier's information:

• AES FX-2 Double Laser 2.5-inch (Rs.8,990): "The central laser emitter acts as a specialized high-beam booster." It "switches instantly between a wide-angle low beam and a laser-assisted high beam."
• AES 2-inch Laser Projector (Rs.8,800): "The internal laser module generates a high intensity center beam."
• AES 2.5-inch Turbo SE (Rs.11,999): "The integrated laser module focuses a concentrated beam of light into a central hotspot."
• AES NV-8 Bi-Laser (Rs.11,999): "powerful high-beam performance."

Read together, the pattern is consistent. The low beam is LED. The laser adds a narrow, long-reaching hotspot in the centre of the high beam. That is a feature for seeing far down an empty road, not for seeing the road surface just ahead through fog.

We have not taken one of these units apart, and we could not find a published AES datasheet with test figures for the laser module. So this article takes the listings at their word. Even at their word, the conclusion holds.

Even BMW only uses laser for high beam

This is not a quirk of aftermarket lamps. When BMW put laser lighting into a production car, the i8 in 2014, it was an optional "laser boost" for the high beam. BMW's launch announcement says the laser "additionally ensures a high beam range of up to 600 metres", roughly double its LED high beam. The low beam on the same car was ordinary LED.

The reason is what a laser light source is good at. In BMW's description, laser diodes fire a blue beam onto a phosphor inside the headlamp, which turns it into white light from a very small, very intense spot. A small, intense source is ideal for throwing a tight beam a long way. That is exactly what you want on an unlit highway and exactly what you do not want in fog.

Why the high beam is the wrong beam in fog

Fog is a cloud of water droplets sitting at eye level. A high beam aims light up into that cloud, and the droplets scatter it back at you as a bright white wall. The advice from Indian road-safety guidance is blunt about it: "High beams do not help in fog. They reflect light back into your eyes and reduce visibility," as a December 2025 fog-driving guide put it, recommending low beam or fog lamps instead.

Reach is also the wrong thing to pay for when you cannot see far anyway. If visibility is down to 50 metres, a hotspot that reaches hundreds of metres is lighting fog, not road. What helps in that condition is light kept low and spread wide across the tarmac, so you can see the lane markings, the kerb and the bike without a tail lamp that is ten metres ahead of you.

There is a legal squeeze too. Fog lamps are meant for seriously reduced visibility. The UK Highway Code, as one clear example of how such rules are written, says drivers must not use front fog lights unless visibility is seriously reduced "as they dazzle other road users". Indian rules on when and how fog lamps may be used are in our fog lamp compliance guide. Put the two together and a laser high mode in a fog lamp housing has a very narrow window: in fog it is the wrong beam, and on a clear night the fog lamps are supposed to be off.

Two more things on the box that do not mean what they suggest

"Laser" in the name, no laser in the description

Our AES FX Laser Bi-LED 3-inch (Rs.9,500) has "Laser" in its product title. Its description talks only about LED technology and a Bi-LED shutter, and never mentions a laser module. We are not saying the unit is mislabelled; we are saying the word in a product name is not evidence of a laser inside. If the laser matters to you, ask the seller what the laser does and in which mode, and get the answer in writing.

The blue lens does not make the light blue, or stronger

Several of these units are sold with a "Blue Lens". The listings describe it as improving "light transparency" and "penetration". The same listings also describe the output as "pure, high-density white light". The blue you see is a coating on the glass. At best a lens coating reduces how much light is lost to reflection at the glass surface. It cannot add light, and it does not change the beam colour. Buy the blue lens because you like the look, which is a perfectly fine reason, not because it helps in fog.

What to judge a fog lamp on instead

When fog is the reason you are buying, these are the things that decide whether the lamp helps. None of them is printed on the front of the box, so check them before fitting, or ask whoever is selling you the lamp to switch it on against a wall.

Laser or not, these are Bi-LED projectors with a low and a high mode, so the low-beam cutoff is the comparison that matters. If you are choosing for fog first, a non-laser Bi-LED projector such as the DHC P-20 Bi-LED (Rs.9,999) or the 3-colour AES 3-inch Bi-LED (Rs.12,999) belongs on the same shortlist as the laser units. Compare them on the low beam, not on the label.

When a laser unit is the right buy

There is a real use for the laser high mode: long stretches of unlit road in clear weather, where you want to see far ahead and there is no oncoming traffic to dazzle. If that describes a good share of your night driving, and you understand the high mode has to be dipped for every oncoming vehicle exactly like your main high beam, a laser unit like the FX-2 is a reasonable choice. Its low beam still has to earn its place in fog on its own merits.

If your plan is to run the high mode constantly because it looks impressive, read our piece on where auxiliary lights are actually legal first. A very bright beam aimed at traffic blinds the oncoming driver, and on a foggy morning that driver is the hazard you are trying to see.

A correction to some of our own older posts

A few of our earlier fog lamp articles listed a laser unit as a pick for "maximum throw in heavy rain" and described laser as giving "extreme throw". The throw is real, but it belongs to the high beam, and heavy rain and fog are when you should not be using it. We would rather say that plainly than leave it standing. For fog and rain, the low beam is the part you are buying.

If you are in Bengaluru, you can see these units at our JC Road counter before you decide, or browse the full range in our LED lights collection.

Frequently asked questions

Are laser fog lamps better in fog?

Not because of the laser. On the AES laser units we stock, the listings describe the laser as a high-beam booster, and in fog you should be on low beam. Fog performance comes from the low beam: a sharp, flat cutoff, a wide spread and correct low mounting and aim.

What does "bi-laser" mean on a fog lamp or projector?

On the units we stock, "bi" refers to the two beams (low and high) switched by an internal shutter, and "laser" refers to a module that adds a concentrated hotspot to the high beam. The low beam is LED. Ask the seller to confirm which mode uses the laser for any specific product.

Does a blue lens fog lamp give blue light?

No. The blue is a coating on the lens glass. The listings for these units describe the output as white light. A coating can reduce reflection losses at the glass, but it cannot add brightness or improve fog penetration.

Should I use high beam in fog?

No. Fog droplets reflect high-beam light back towards the driver and reduce what you can see. Use low beam, and fog lamps if your car has them, and switch fog lamps off when visibility improves.

Is a laser fog lamp worth it?

Only if you regularly drive unlit roads in clear weather and will dip the high mode for oncoming traffic. If fog is the main reason you are buying, compare fog lamps on their low beam, and a non-laser Bi-LED projector may serve you just as well.