How To Choose the Best Light Bulbs For Subaru Outback? Complete Guide

By Nick Marchenko, PhD

Updated: November 10, 2023

When the darkness envelopes the road like a thick, black velvet curtain, it's the robust gleam from your Subaru Outback's headlamps that pierces through, guiding you safely. But remember, even the brightest stars in the sky eventually flicker out, and so do the bulbs in your trusty steed.

Whether you're undertaking a quest for the perfect bulb replacement or simply looking to infuse your Subaru Outback with a blaze of upgraded luminescence, knowing your bulb size for the low or high beams is crucial.

Could this be your adventure? Are you the brave soul looking to conquer the dim and upgrade to LED or HID lights? Then, dear traveler, read on.

How to Choose the Ideal Bulbs for Your Subaru Outback

Choosing a light bulb for your Subaru Outback may seem as simple as picking the ripest apple from the tree, but it is actually a quest filled with important considerations:

• The specific bulb location you're aiming to upgrade;
• Base type of the bulb;
• Light output needed;
• Bulb size (type);
• Color temperature of the light.

Finding the Correct Bulb Base for Your Subaru Outback

Observe the bulbs: one is for the headlight, the other for the glove box. Their differences are more than just size; it's the base type that matters, as each bulb nestles into its own unique socket within your Subaru Outback.

Securing the right bulb with the appropriate base is tantamount for several reasons:

Compatibility

The correct base ensures that the bulb connects seamlessly with your Subaru Outback's socket. Imagine trying to fit a square peg into a round hole; it's not just futile, it's downright blasphemous.

Electrical Safety

Choosing the wrong base could invite electrical gremlins, causing short circuits or worse. It's a path that leads to the dark side, with costly repairs lying in wait.

Lighting Efficacy

With the right base, the bulb sits in perfect harmony within the socket, ensuring peak lighting performance. Anything less could cast shadows or uneven light, turning night driving into a guessing game.

Durability

A bulb that fits snugly will resist the rigors of the road, avoiding premature failure. The wrong base, however, may lead to a loose bulb, more frequent changes, and an unhappy wallet.

To make the quest less daunting, our comprehensive guide lists the specific Subaru Outback bulb sizes for each location.

The Different Types of Subaru Outback Bulbs

Within the heart of your Subaru Outback, there are halogen, LED, and xenon bulbs, each with their own set of merits and downfalls. It's a decision that shapes the night itself.

Halogen Headlights for Subaru Outback

Emission Source

Halogen bulbs are like miniature suns, with a tungsten filament encased in a glass bulb, filled with halogen gas that lights up the road with a warm, yellow glow.

Intensity

They're the steadfast old guard of headlights, offering a reliable beam at a cost that won't keep you up at night.

Design

These bulbs are little marvels of engineering, with a filament that’s rejuvenated by the halogen gas, granting them a longer life than you might expect from such humble technology.

Advantages:

• Wallet-friendly;
• Universally compatible;
• A beam that's bright but not blinding.

Disadvantages:

• Their glow may fade to a gentle ember over time;
• They live a life that’s brilliant but brief;
• They run hotter than a summer’s day, which could lead to their downfall.

Revving Up Your Subaru Outback with LEDs (Light Emitting Diodes)

Emission source

LEDs bring forth a torrent of light as electrons dance through a semiconductor, unleashing a radiant energy that’s as efficient as it is brilliant.

Brightness

These little marvels illuminate the Outback's path with a spectrum of vibrant colors, boasting an impressive lifespan that’s sure to outlast your greatest adventures.

Construction

Constructed with a legion of tiny diodes on a circuit board, encased in resilient plastic or glass, these bulbs are the vanguards of your night-time escapades.

Pros:

• They shine with a brilliance that banishes the shadows far beyond the halogens’ reach;
• Endurance that rivals the Outback's legendary stamina;
• They run cooler than a mountain breeze, sparing your lamp the scorch of battle;
• Available in a kaleidoscope of hues to match your adventurous spirit.

Cons:

• Like a mischievous imp, if not properly harnessed, they may falter and fade away;
• They might bewilder the car’s brain - the ECU - into thinking the light is just a phantom, causing it to signal a false alarm.

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Is it Possible to Install HID or Xenon in the Stock Subaru Outback Headlights?

Emission source

Xenon, or High-Intensity Discharge (HID) bulbs, summon light with an electric arc that leaps between tungsten electrodes in a xenon-gas embrace.

Brightness

Their light is a bright, white beacon, akin to the midday sun but condensed into a beacon for your nightly drives.

Construction

These bulbs are a technological odyssey, with a chamber and electrodes designed to withstand the fury of the arc they generate.

Pros:

• They cast the brightest light known to automobiles, piercing through the night;
• A symphony of colors at your fingertips, all within the power spectrum;
• They sip on power as gingerly as a fine wine.

Cons:

• They demand precise alignment; otherwise, they’ll blind others like a rogue spotlight;
• Without the proper lenses, they’re just unruly, dazzling onlookers and causing a spectacle;
• They come with a complex entourage of equipment to keep them shining.

Choosing the Optimal Color Temperature for Subaru Outback Headlights

Subaru Outback bulbs, much like their owners, have their own personalities reflected in the color of their glow. This is measured in Kelvin - a scale of light’s warmth or coolness.

A lower number whispers tales of a mellow, yellowish hue, while higher numbers shout of bright, bluish beams. The crowd favorite is a bulb at 6000K, striking a balance between a gentle glow and the clarity of a bright, alpine dawn.

Additional Considerations for Selecting the Perfect Bulb for Your Subaru Outback

Embarking on the quest for the ultimate light bulb for your Subaru Outback isn't just about grabbing the shiniest one from the shelf. It's a road trip through factors that ensure your nocturnal journeys are brightly lit. Let's illuminate the key considerations:

Luminous Flux Output (Lumens):

The luminous flux is the measure of the brightness you'll command. Measured in Lumens, think of it as the horsepower of light. The higher the number, the more you'll turn night into day.

Voltage

The voltage of the bulb must march in lockstep with your Outback's electrical heartbeat. The right voltage ensures your lights don't flicker out in an epic saga of darkness.

Wattage

Wattage is the thirst of your bulb - how much electrical nectar it sips. Match the wattage to your Outback's appetite to prevent a feast that could end in an electrical famine.

Water-/Dust Resistance

IP ratings are like your bulb's armor against the elements. The higher the number, the braver it'll be against the onslaught of water and dust, ensuring your lights keep shining through monsoons and dust bowls alike.

Manufacturer

Pick a chariot-maker of repute, one with a storied history of forging bulbs that last - the Valhallas of the lighting world. A good brand often promises a warranty, a trusty shield against the specter of early failure.

Choosing Bulbs for Various Positions in Your Subaru Outback

Just as knights have their roles at the round table, so too do bulbs in your Outback. Some positions demand a blinding beacon, while others are content with a steadfast glow.

Here are some knightly tips for selecting the perfect bulb for your vehicle's various lighting positions:

Headlight Bulbs for Subaru Outback

Champion Bulb Sizes:

• H1;
• H4 (9003);
• H7;
• H11;
• 9005 (HB3);
• 9006 (HB4).

The headlights are the lighthouses guiding you through the sea of night. They're not just lights; they're beacons of safety, the eyes of your Outback. Choose xenon if you've got the coins, for their radiant glow is unparalleled. But remember, xenon bulbs are like wizards - they require the proper setting to work their magic without blinding the villagers.

If your coin purse is lighter, LED bulbs are your trusty steeds. They're almost as bright as xenon, without the need for enchantments during installation.

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Subaru Outback Fog Light Bulbs

Renowned Bulb Sizes:

• H11;
• H3;
• 9006 (HB4);
• 9005 (HB3);
• H8;
• H10.

Fog lights are the scouts of your vehicle, piercing through the fog of war - or just a foggy morning. Their valor in the face of mist and rain is legendary. Opt for LED bulbs in the 6000K-7000K range, for they shine like the swords of a thousand knights, cutting through the fog and lighting your path to victory.

Subaru Outback Turn Signal Light Bulbs

Stalwart Bulb Sizes:

• 1157 (BAY15d);
• 3157 (T25);
• 7443 (T20);
• 1156 (BA15s);
• 3156 (T25);
• 7440 (T20).

In the automotive ballet that is road traffic, your turn signals are your dance moves. They must be clear, they must be bright, and by Jove, they must be visible from afar. LED bulbs are the order of the day for this position, shining in resplendent orange for front and back, or red for those tail-end performances (if you're in the U.S., that is).

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Subaru Outback Brake Light Bulbs

Esteemed Bulb Sizes:

• 1157 (BAY15d);
• 3157 (T25);
• 7443 (T20);
• 1156 (BA15s);
• 3156 (T25);
• 7440 (T20).

Brake lights are like the fiery dragons of your chariot, heralding your deceleration. They need to roar with visibility, warning fellow road knights of your intentions. LEDs are your flaming arrows here, red as the sunset, and reliable as the dawn.

Subaru Outback Dome / Map Light Bulbs

Champion Bulb Sizes:

• 194 (T10);
• 168 (T10);
• 921 (T15);
• 578 (Festoon);
• 6411 (Festoon);
• 31mm (Festoon).

For those intimate cabin moments, when you're pondering over maps or the passengers are lost in their books, you need a gentle, enlightening glow. Halogens will do nicely here, casting a light that's as soft as a lullaby, and lasting longer than your longest road trip.

Subaru Outback Dashboard Light Bulbs

Renowned Bulb Sizes:

• 74 (T5);
• 194 (T10);
• 168 (T10);
• 37 (T5);
• 2721 (T5).

Your dashboard is your command center; it should light up like the console of a spaceship. If your Outback is from the analog era, give it a dash of futurism with diode bulbs, creating a cockpit ambience that’s out of this world. Just ensure they don't outshine the stars.

In Conclusion

Choosing the right bulb for your Subaru Outback is an art form - one that takes into account luminous flux, voltage, wattage, and the ability to withstand water and dust. It’s a symphony of light, and you’re the conductor. Select with care for each position - be it the head, tail, turn signals, brake lights, dome (map light), or dashboard lights. And always nod to the manufacturers who craft these little lighthouses with dedication. Your Outback deserves nothing less.