One of your landscape lights has gone dark. The obvious fix is to swap the bulb, but with modern LED fixtures that isn’t always possible, because a lot of them don’t have a bulb at all. Before you head to the hardware store, it helps to know what kind of fixture you have, which bulb it takes, and when a dark light is a sign of something other than a burned-out lamp.

This guide covers the common landscape lighting bulbs, how to choose a replacement that matches the rest of your system, how long each type lasts, and whether it’s worth converting older halogen bulbs to LED.

Can You Replace the Bulb in an LED Landscape Light?

It depends on which of the two types of LED fixture you have.

• Lamp-based fixtures have a socket and a separate LED lamp (the bulb) that plugs into it. When the lamp fails, you replace it just like a traditional bulb. Many professional systems use this design, and so do older halogen fixtures that have been converted to LED.
• Integrated LED fixtures have the LEDs built into the fixture on a circuit board. There’s no bulb to remove. When the LEDs fail, you replace the fixture, or on some designs a sealed LED module inside it.

The quickest way to tell them apart is the paperwork from your installer or the fixture’s spec sheet. If you don’t have either, turn off the transformer, let the fixture cool, and remove the lens or cap. If you see a bulb sitting in a socket, it’s lamp-based. If you see a flat board of LEDs or a sealed unit with no socket, it’s integrated.

Landscape lighting bulbs can usually be replaced pretty easily – but if you need help, contact the professionals to do it for you.

The Most Common Types of Landscape Lighting Bulbs

Low-voltage landscape fixtures use a handful of standard lamp shapes. The base, meaning the part that plugs into the socket, is what you need to match.

• MR16 (GU5.3 bi-pin base): The most common landscape lamp by far. You’ll find it in most spotlights and uplights aimed at trees, walls, and architectural features.
• MR11 (GU4 bi-pin base): A smaller version of the MR16 for compact fixtures. It isn’t made in very high outputs, so it’s used for smaller accent lights.
• PAR36: One of the original low-voltage landscape lamps. It’s a sealed, watertight lamp, which is why it still turns up in older floodlights and in-ground well lights.
• T3 (G4 bi-pin base): A small capsule lamp with two thin pins, common in path lights and some deck and step lights.
• T5 wedge: A small lamp with a flat glass or plastic base that pushes straight into the socket. It’s widely used in path lights and lower-cost fixtures.
• S8 and single contact bayonet: Older styles that push in and twist to lock. They’re less common in newer professional fixtures but still show up in existing systems.

If you’re not sure which one you have, take the old lamp with you or photograph the base and any markings before buying a replacement.

How to Choose the Right Replacement Bulb

When you’re shopping for landscape lighting replacement bulbs, matching the base gets the bulb into the socket. Matching everything else is what keeps your lighting looking like a single, consistent system rather than a patchwork.

Voltage

Residential landscape systems almost always run on 12V low voltage, so use 12V lamps only. Never put a 120V bulb in a low-voltage fixture. LED lamps also tolerate a wider voltage range than halogen. Quality LED lamps typically run anywhere from about 8V to 15V, while halogen lamps need a much tighter range of around 10V to 12V.

Color temperature

Warm white is the standard for residential landscape lighting, and 2700K is the most common choice, with 3000K also popular, particularly on plants. The most important rule is consistency. A single 4000K replacement among 2700K lights stands out immediately at night, so check the color temperature of the lamps around it and match them.

Beam angle

MR16 and MR11 lamps come in different beam spreads, and swapping a narrow beam for a wide one changes the look of whatever the fixture lights. As a rough guide, about 12° is used for flagpoles and very tall, narrow subjects, 24° for columns and narrow trees, 35° to 38° for spaces between windows and medium trees, and 60° or wider for walls, facades, and broad shrubs. The beam angle is usually printed on the old lamp.

Brightness

With LEDs, watts tell you how much power a lamp uses, not how bright it is. Look at lumens instead, and aim to match the output of the original lamp and its neighbors. A replacement that’s noticeably brighter than the others will create a hot spot.

Quality and ratings

Outdoor lamps sit in a hot, damp, enclosed space for years. Look for lamps rated for damp or wet locations and carrying a UL or ETL listing. Better LED lamps also have a protective coating on the circuitry to resist moisture and corrosion, which is one reason very cheap replacement bulbs can fail early.

How Long Do Landscape Light Bulbs Last?

The gap between halogen and LED is huge. Halogen landscape lamps are generally rated somewhere between 2,000 and 10,000 hours, depending on quality. Quality LED landscape lamps are commonly rated at around 40,000 to 60,000 hours.

In practical terms, if your lights run about eight hours a night, that’s roughly 2,900 hours a year. A 2,000-hour halogen lamp can fail within the first year, while a 40,000-hour LED lamp should last well over a decade. Real-world life depends on heat, moisture, and stable voltage, which is why a well-designed system with properly sealed fixtures gets much closer to the rated figures.

Should You Switch Halogen Bulbs to LED?

For most older systems, yes. LED lamps can match halogen output using up to 85% less power, they last many times longer, and they run far cooler, which is easier on fixture seals and lenses. Many existing halogen fixtures can take a drop-in LED replacement of the same lamp type, so the fixtures themselves often don’t need replacing. If running costs are a concern, our post on whether landscape lighting increases your electric bill breaks down what a typical LED system costs to run.

There are a few things to get right when converting:

• Convert a whole zone at once. Halogen and LED lamps look different in color and output. Mixing them on the same part of the property usually looks uneven.
• Check the voltage. Older halogen systems were often set up to deliver a specific voltage at each fixture. Removing most of the load changes that, so it’s worth measuring voltage at the fixtures after converting.
• Check the transformer. Some older transformers, particularly certain electronic types, don’t behave well with very low LED loads. A magnetic low-voltage transformer generally handles LEDs well. Our guide to what a landscape lighting transformer does explains how sizing and load work.

Integrated or Replaceable: Which Is Better?

Both have a place. Integrated LED fixtures are fully sealed from the factory, which helps keep moisture out, and the LEDs and optics are designed together for consistent output. The trade-off is that when the LEDs eventually fail, you’re replacing a fixture or module rather than a bulb.

Lamp-based fixtures are easier and cheaper to service and let you change beam angle or color temperature later just by swapping lamps. The trade-off is one more seal and socket that has to stay dry. The right choice depends on the fixture, where it’s installed, and how much flexibility you want down the line, which is worth talking through with your lighting designer before you choose.

Replacing a Landscape Light Bulb Safely

If you have lamp-based fixtures and want to replace a bulb yourself, a few habits make a big difference:

• Turn the system off at the transformer first, and give halogen lamps time to cool. They get very hot.
• Don’t touch the glass of a halogen lamp with bare fingers. Skin oils can create hot spots that shorten its life. Use a clean cloth or gloves.
• Seat the new lamp firmly and straight in the socket, then re-aim the fixture if it was knocked during the swap.
• Check the lens gasket or O-ring before closing the fixture. A cracked or missing seal lets in water, which is one of the most common reasons lamps fail early.
• Turn the system back on and check the result after dark to make sure the new lamp matches its neighbors.

When the Bulb Isn’t the Problem

If a new bulb doesn’t fix it, or several lights are out at once, the lamp probably isn’t the cause. Common culprits include a corroded or loose connection, a cable damaged by digging or aeration, voltage drop on a long run, a tripped GFCI outlet, or a failing transformer. Lights that are dim rather than dark often point to a voltage issue rather than a lamp issue. Our outdoor lighting repair guide walks through the most common causes in more detail.

These are the problems where a professional saves time and guesswork. Landscape Illumination technicians test voltage at the fixtures and the transformer, trace faults along the cable, replace failed lamps or integrated fixtures with matching color temperature and beam spread, and reseal fixtures so the repair lasts. If you’re running an older halogen system, we can also plan an LED conversion zone by zone so the whole property stays consistent.

If you’ve got lights out and aren’t sure whether it’s the bulb, the fixture, or the system, our team can take a look and get everything back to working properly.