Low Beam vs. High Beam vs. Fog Lights (When To Use Which)

Driving at night (or in otherwise dim conditions) is more hazardous than driving during the day.

Why?

You can’t see so distinctly, making it more difficult to adapt to what’s happening or about to happen around you.

Headlights and fog lights are, of course, crucial to night driving. But which type should you use? And when?

In this guide, I will explore low beam vs. high beam vs. fog lights and describe when you should use each and what they’re intended for.

What Are Headlights vs. Fog Lights?

Headlights come in two settings: low beam and high beam. When you turn the headlights on, they’ll automatically set to low beam. You can activate the high beam setting by either pushing or pulling the turn signal stalks (depending on your car).

The difference between high beams and low beams will be explained below. In brief, high beams allows you to see much farther ahead (in most situations) but will blind other road users. As such, low beams will be used much more frequently.

Don’t confuse the headlights with the sidelights/parking lights. These are the setting before the low beams on the dial/stalk, and they remain on at the same time as the headlights to assist them.

You can use sidelights while driving in the daytime to enhance your visibility to other road users. However, their original function was – and still is – to highlight your location when you’re parked on the side of a busy road or in heavy fog.

Sidelights only draw a low wattage (which is why they aren’t very bright), so they are carefully designed to not discharge a battery when left overnight. However, you should switch them off the following day and take your car for a good drive to recharge the battery.

Finally, fog lights. Fog lights are found in a separate unit from the headlights and sidelights. They can legally only be used in dense fog when visibility is less than 100 meters (328 feet). It’s crucial to remember to switch them on and off whenever appropriate.

When Should I Use Low Beam Headlights?

Low-beam headlights are activated by turning the dial on the dashboard or the turn signal stalk. Various manufacturers put this in other places, but they’re almost always in one of these common locations.

You should use low-beam headlights when you’re driving in the faint in the following situations:

• In a residential area
• When there’s oncoming traffic
• During a rainstorm/snowstorm/hailstorm
• In a tunnel
• When thick clouds significantly obscure the sun
• At dusk and dawn (it’s most difficult to see at these times as your eyes adjust)
• In parking lots

Low Beam Headlights Advice

They’re referred to as “dim beam” headlights because they direct the light downwards at the road, offering visibility up to approximately 300 feet. Older vehicles or vehicles with dirty headlights may have significantly reduced light range.

Since they point down at the road, low-beam headlights shouldn’t ever blind oncoming traffic or vehicles ahead of you.

Low-beam headlights illuminate the road and make your presence apparent to other street users.

Exceptions might apply when you’re going over the crown of a hill or a speed bump. At this point, your car is temporarily angled so the lights could shine directly at another driver. However, this is short and unavoidable, so it isn’t considered hazardous.

You might have been astonished to read that low-beam headlights should be used when it’s raining or snowing. It’s actually crucial to do this.

Rain and snow reflect and refract light back at you. If you use your high beams, you’ll get much more reflective glare back in your eyes. It also risks blinding other road users when driving in potentially hazardous conditions.

If you use low-beam lights, in contrast, you will find that your eyes are much more focused on the road ahead and your surroundings instead of the falling rain or snow.

When Should I Use High Beam Headlights?

Your bright-beam headlights are activated by pushing or pulling the turn signal stalk, causing the high-beam indicator to appear on your instrument panel. The low-beam headlights must already be switched on for the high beams to be activated unless you’re just flashing your illumination.

Pulling the stalk to flash your lights momentarily activates the high beams, ensuring whoever you’re communicating with sees your message.

Note: flashing your lights should only be done as a warning to other motorists. A misinterpretation caused by flashing your lights could lead to a collision, for which you’d be held responsible.

Use your high-beam headlights when you’re driving in the dark and:

• On open road
• When there isn’t any oncoming traffic or cars ahead of you
• You aren’t in a residential area (you don’t want to wake people up)
• When driving along dangerous roads (narrow, windy, gravel, cliffside, etc.)

High Beam Headlights Advice

High-beam headlights allow you to see much farther down the road. You can usually distinctly see at least 500 feet.

The danger with high beam headlights comes from blinding other drivers. The lights are exceptionally bright, and if another car in front of you (on either side of the road) isn’t prepared for it, you could cause a catastrophic crash.

Always turn your intense-beam headlights off if anyone’s in front of you! This includes approaching traffic, cars ahead of you in your lane, stationary vehicles, and cars turning onto/off your road at an intersection.

Some modern cars come with sensors. These automatically switch the high beam on and off whenever it detects the presence of other vehicles. While these systems are excellent for drivers who regularly forget, they aren’t perfect. In reality, you should be concentrating more on manually switching the high beams on and off yourself.

If someone approaches you with their dazzling beams, flash your lights. This should warn them, and they’ll turn them off.

If they don’t and you feel your eyes starting to constrict, take your foot off the throttle pedal and look down at the edge of your side of the road. That’s down and to the right if you’re in the States. This means you can still see the road’s direction without being blinded. In extreme cases, you might need to stop the car.

When Should I Use Fog Lights?

When driving in thick fog, it is recommended to utilize fog lights. These lights are specifically designed to substantially enhance the visibility directly in front of your car by illuminating a rectangular area.

In particular, you should use fog lights to get a clear view of the side of the road, allowing you to drive more safely.

Fog lights are exceptionally bright and dazzle other drivers even more intensely than high beams. It’s easy to forget and leave them on by accident, so you must always be alert.

Use fog lights when:

• You’re driving in thick fog (less than 100 meters/328 feet of visibility) and struggling to see other road users around you.
• You’re driving in other hazardous situations inhibiting your view of the roadside, such as smoke, dust storms, sandstorms, and extreme rain.

You must switch your fog lights off as soon as visibility improves. This is enforced by law (depending on where you are), and failure to do so could land you a fine.

Fog Lights Advice

You should only ever use fog lights in the most extreme of circumstances. Most of us won’t ever need to switch them on more than a couple of times per year, although that depends on your local climate.

Switching them off as soon as you can see better is absolutely vital.

Switching them on is equally crucial when visibility becomes extremely poor. This is both about helping you see the road and ensuring other cars – in front of and behind you – can see you.

Fog Lights vs. Low Beams

Despite what some people might tell you, fog lights aren’t the same as low-beam headlights. They’re much more blinding and hazardous in the wrong circumstances.

Fog lights won’t make much difference to your long-distance visibility (hence the confusion) – they’re all about vividly illuminating the road immediately in front of you.

Fog Lights vs. High Beams

Knowing the distinction between when to use high beams and when to use fog lights is crucial.

Use fog lights for drastically reduced visibility – something is blocking the light. Use high beams (or low beams, whichever is most appropriate) for restricted visibility – i.e., when it’s dark.

How Can I Get More Light From My Headlights?

Get more lights from your headlights by using high-quality, radiant bulbs. You’ll find different bulbs with varying brightnesses, measured in lumens. Getting the highest one for the best visibility is usually a prudent idea. However, you’ll need to ensure it’s compatible with your car and won’t dazzle other drivers.

You should also periodically check your bulbs. For this, you’ll need to sit in the car and get a friend to look at all the lights as you switch them on. They can then tell you which (if any) aren’t working.

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• Sidelights (front, rear, and license plate)
• Low beam headlights/rear lights
• High beam headlights
• Fog lights (front and back)
• Turn signals/hazard warning lights (front, back, and side)
• Brake lights
• Reverse light

A mechanic can also use an adjustment tool to ensure your headlights are angled properly. If they’re too low, you might not be getting enough light. Too high, and they’ll dazzle other road users.

Finally, your headlight covers might be grimy. You could replace them, but it makes much more sense to consider purchasing a headlight cleaning kit. The Turtle Wax kit is widely touted to be the finest if you know how to use it.

Spend around half an hour buffing down each headlight for each of the four grades before polishing at the end. Your headlights will be as clear as new.

Conclusion

And that’s low beam vs. high beam vs. fog lights! In summary, stick to the following guidance:

Use low beam headlights when driving slow in busy or residential areas during dusk and when driving through tunnels. These headlights should be used as your standard headlights during the night.

High beam headlights – these are for high speeds in rural areas when you need to see further ahead. Remember to switch them off when other cars are in front of you!

Fog lights – these are for when your visibility is substantially impaired by fog or other similar hazards.