If your yard still runs on halogen, you already know the routine: bulbs that burn out every season or two, fixtures that run hot enough to scorch nearby leaves, and an electric bill that creeps up every summer. Moving from halogen to LED landscape lighting solves all three, and it is one of the highest-return upgrades you can make to an existing system.
But "just swap the bulbs" is not always the right answer. This guide covers what changes, what can stay, and how to avoid the flicker and color mismatch that make some LED conversions disappointing.
Why switch from halogen to LED landscape lighting
Energy use
A typical halogen MR16 landscape lamp draws 35 to 50 watts. An LED lamp with comparable brightness usually draws 4 to 7 watts. Multiply that difference by every fixture in the yard and every night of the year, and the savings add up quickly.
Lamp life
Halogen lamps are commonly rated somewhere around 2,000 to 4,000 hours. Quality LED lamps and integrated LED fixtures are commonly rated for 25,000 hours or more. At six hours a night, that is the difference between replacing lamps every year or two and going many years without touching them.
Heat and load
Halogen lamps run very hot, which bakes gaskets, fades lenses and can damage nearby plants. LEDs run much cooler. The lower load also frees up transformer capacity, so the same transformer can often power more fixtures after a conversion.
Worked example: savings at 15¢ per kWh
Here is a realistic Texas example: 20 fixtures, each converted from a 35-watt halogen lamp to a 5-watt LED, running six hours a night, at 15 cents per kWh.
| Halogen (35 W) | LED (5 W) | |
|---|---|---|
| System load (20 fixtures) | 700 W | 100 W |
| Energy per night (6 hours) | 4.2 kWh | 0.6 kWh |
| Energy per year | 1,533 kWh | 219 kWh |
| Cost per year at 15¢/kWh | $229.95 | $32.85 |
| Annual savings | $197.10, about 86% less | |
That figure does not include the lamps you no longer buy, or the time spent replacing them. Halogen systems with 50-watt lamps, longer run times or more fixtures save even more. Plug your own numbers into our LED savings calculator to see your break-even point, or use the energy cost calculator to estimate what your current system costs to run.
Retrofit lamps vs full fixture replacement
There are two ways to convert, and the right one depends on the condition of what you already own.
Retrofit LED lamps
Many halogen fixtures use standard bi-pin MR16 (GU5.3) or PAR36 lamps. Drop-in LED replacements exist for both. Retrofitting makes sense when:
- Fixtures are solid brass, copper or quality aluminum in good shape
- Lenses, gaskets and sockets are intact and not corroded
- The fixture has enough interior room for the LED lamp's heat sink
- You are happy with current fixture placement
New integrated LED fixtures
Integrated fixtures have the LED and driver built in and sealed. Full replacement is the better call when:
- Fixtures are cracked, rusted or have melted sockets from halogen heat
- Lenses are clouded or the housing leaks water
- The original layout has dark gaps or glare problems
- You want adjustable beam spreads, dimming or smart color control
Watch out: Cheap retrofit lamps are the most common source of early LED failures. A lamp that overheats inside a sealed fixture or lacks a quality driver can dim, shift color or die within a couple of seasons, especially in a Texas summer.
Transformer compatibility: magnetic vs electronic
The transformer is where many DIY conversions go sideways. Before you swap a single lamp, find out which type you have.
Magnetic transformers
Most professional landscape transformers use a heavy magnetic (toroidal or core-and-coil) design. These generally work well with LED loads. One thing to watch: magnetic transformers can deliver slightly higher voltage when lightly loaded, and a halogen system converted to LED might drop from 600 watts to under 100. Measure voltage at the fixtures after the conversion and move to a lower tap if any run sits above the lamp's rated range.
Electronic transformers
Some lighter-duty and older kit transformers are electronic. Many electronic transformers have a minimum load requirement, and when a low-wattage LED load falls below it, the output can flicker, cycle on and off, or shut down entirely. If you have an electronic transformer, look for LED lamps specifically rated for it, or plan to replace the transformer as part of the upgrade.
Right-sizing after the switch
Converting often leaves a big transformer lightly loaded. That is not a problem with a quality magnetic unit, and the spare capacity is useful if you plan to add fixtures. If you are replacing the transformer anyway, see our guide to landscape lighting transformer sizing for the 80% rule and voltage drop math.
Matching color temperature
Halogen light is warm, typically around 2800K to 3000K, with excellent color rendering. Early LEDs had a reputation for cold, bluish light, but today's warm-white options match halogen closely if you choose carefully.
- Choose 2700K for a warm, traditional look on brick, stone and stucco, or 3000K for a slightly crisper white.
- Look for a CRI of 90 or higher so foliage, stone and brick colors look natural.
- Buy every lamp for a given area from the same product line so colors stay consistent.
- Convert a whole zone at once. Mixing halogen and LED side by side makes the difference obvious.
- Match beam spreads to the original lamps, or adjust aim if the new beam is narrower.
For a deeper look at warm vs cool tones, see warm white vs cool white landscape lighting, or try our color temperature guide.
Audit the system
Count fixtures, note lamp types and wattages, and inspect each housing, lens and socket.
Identify the transformer
Check the label for magnetic or electronic, total rating and available taps.
Test one zone
Convert a single run, then watch it for a few nights for flicker, color and brightness.
Measure and adjust
Check voltage at the nearest and farthest fixtures, change taps as needed, and re-aim lamps.
Finish the rest
Convert remaining zones, replacing any fixtures that failed the inspection.
Common halogen to LED landscape lighting mistakes
Most disappointing conversions trace back to the same handful of shortcuts. Avoid these and your new LED system should look better than the old halogen one ever did.
Matching watts instead of light output
A 35-watt halogen lamp and a 35-watt LED are not equivalent. Compare lumens and beam angle, not wattage. Many LED packages list a "halogen equivalent" figure, which is a useful starting point, but real-world brightness varies by brand. Test one lamp before buying a case.
Ignoring the beam spread
Halogen MR16 lamps come in familiar beam codes such as narrow spot and wide flood. LED replacements often have different beam shapes, and a lamp that is too narrow can turn a softly washed column into a hard stripe. Match the beam to the job: narrow for tall palms and columns, wide for broad facades and shrub masses.
Leaving old wiring problems in place
Halogen systems drew heavy current, so years of operation may have cooked splices and corroded connections. The lower LED load hides some of that damage, but bad connections still fail. A conversion is the right time to cut out and reseal old splices.
Forgetting the timer
Many older halogen systems still run on mechanical timers that need resetting after every daylight saving change. Pair the LED conversion with an astronomical timer or smart controller so the new system runs on schedule without attention.
Let us handle the conversion
We convert halogen systems across Texas, from older neighborhoods in San Antonio to established lots in The Woodlands. Every upgrade includes a fixture-by-fixture inspection, transformer check and voltage test, plus a final adjustment visit after dark. Learn more about our repair and upgrade services.
Ready to stop replacing bulbs? Schedule a free consultation and we will tell you which fixtures can be retrofitted, which should be replaced, and what you can expect to save.
