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Choose a landscape lighting transformer by matching its output to the lamps or fixtures, checking the complete electrical load, and evaluating the cable layout. Then confirm outdoor suitability, protection, controls, and room for planned additions.
Wattage is only one part of the decision. A transformer with enough total capacity can still be unsuitable because of its output type, individual circuit limits, control compatibility, or installation requirements.
For contractors, distributors, and project buyers, a clear fixture schedule and wiring plan make product comparisons more useful than selecting from capacity labels alone.
Table of Contents
Check the input requirements of every connected lamp or integrated fixture.
A conventional landscape transformer commonly provides low-voltage AC. Other lighting products may require regulated DC or a constant-current driver.
These outputs are not interchangeable. A “12V” marking alone does not establish compatibility.
For replaceable-lamp fixtures, verify the selected lamp as well as the fixture rating. For integrated LEDs, use the requirements of the complete product and its driver.
Also confirm the permitted voltage range. Do not assume every LED accepts 9–15V or operates equally well on AC and DC.
Confirm the installation’s mains voltage and frequency before ordering.
A transformer specified for 120V input should not be connected to a different supply unless its documentation explicitly permits it. Plug configuration, installation method, and required approvals also need review for the destination market.
For international projects, include the destination supply information in the quotation request rather than assuming that a product shown online matches local conditions.
Magnetic transformers use a line-frequency core and windings. Common constructions include toroidal and laminated EI cores.
Traditional electronic transformers may provide high-frequency AC, while LED power supplies can provide regulated DC or constant current.
Each category contains different designs. Minimum load, secondary lead restrictions, dimming, and lamp compatibility must be checked for the specific model.
A technology label does not guarantee silence, efficiency, surge protection, or service life.
List all lights planned for the initial installation and any defined future phase.
Schedule item | Information to collect |
|---|---|
Product identification | Fixture model and replaceable lamp model, if applicable |
Quantity | Number operating on each run |
Electrical input | Voltage range and AC/DC requirements |
Load | Published VA, input current, or relevant input-power data |
Controls | Switching, dimming, or connected-control requirements |
Location | Cable run and branch assignment |
Future additions | Actual proposed products and quantities |
Separate current demand from optional future additions so the purchasing decision remains transparent.
For AC lighting, published input current or VA can provide a better basis for loading than lamp watts alone.
Where input watts and power factor are available at the relevant operating condition:
Apparent power (VA) = input watts ÷ power factor
For example, a 5W input load with a power factor of 0.80 represents 6.25VA. Twelve such loads total 75VA.
This is an illustrative calculation, not a Radar Lighting specification.
Do not multiply every LED wattage by a fixed factor and treat the result as verified VA. Request the missing electrical data from the supplier.
Power factor also differs from conversion efficiency. The two should not be used interchangeably.
Compare the calculated demand with the selected transformer’s instructions, including individual circuit and terminal limits.
Account for any required temperature derating or other operating restrictions. Where the manufacturer’s method requires cable losses, calculate them from the actual circuit rather than using a fixed watts-per-distance allowance.
A reserve for expansion may be sensible, but it should reflect the project. Do not present an optional design allowance as a universal rule that every transformer must operate below 80% of its rating.
Review Radar Lighting’s landscape transformer range after the load schedule is established. Then request the specific model’s permitted loading and circuit arrangement.
Voltage drop depends on cable resistance and the current carried through each segment.
Use actual routing distances, including detours around structures and planting areas. In a distributed run, upstream cable sections carry the combined current of downstream lights.
The transformer’s total capacity does not remove cable resistance. A larger unit may support more load while leaving the voltage-drop problem unchanged.
Check cable suitability for current, exposure, installation method, terminals, and connectors alongside the voltage calculation.
A multi-tap transformer provides different output-voltage connection points. These can help match the supply to calculated cable losses.
Radar Lighting’s RTR-50W/100W/150W-SS series lists 12V, 13V, 14V, and 15V taps.
A higher tap is useful only when every connected fixture remains within its permitted input range. The nearest light may receive more voltage than the farthest one.
A single-tap transformer can still be suitable where the layout and load deliver acceptable fixture voltage. Multiple taps are not mandatory for every LED project.
Different output voltages do not automatically provide independently scheduled lighting zones.
If pathway lights must remain on overnight while decorative lighting switches off earlier, confirm that the system has separately controlled outputs or another approved arrangement.
Likewise, several terminal positions do not necessarily mean each has an independent capacity allowance. Request the wiring and protection diagram.
A centralized transformer may simplify equipment access and control. Separate transformers may shorten low-voltage runs for widely spaced areas.
Compare supply availability, cable cost, installation work, maintenance access, and operating schedules.
Keep outputs separate unless the manufacturer explicitly supports an interconnected arrangement. Do not improvise connections between different transformers or voltage taps.
Assess exposure to rainfall, irrigation, condensation, standing water, sunlight, and corrosive conditions.
Enclosure material alone does not establish the environmental rating. Stainless steel, coated metal, and suitable polymers can serve different applications when properly designed.
Follow the documented mounting position, clearances, drainage, ventilation, and operating-temperature requirements. A weather-resistant product is not automatically suitable for burial or immersion.
Installation must also meet applicable local requirements. Supply-side work should be completed by appropriately qualified personnel.
Ask what overload, short-circuit, and thermal protection is supplied and how the circuits are arranged.
Fuses and resettable breakers can both be appropriate in an engineered product. Compare protection ratings, coordination, and approved service procedures rather than judging quality solely by the reset method.
Confirm which parts are user-serviceable. A protective trip requires investigation before repeated resetting, and a fuse must only be replaced with its specified type and rating.
For higher-capacity projects, review the RTR-300W/600W-SS series and request model-specific circuit details.
A fixed timer follows programmed hours. An astronomical timer calculates sunrise and sunset from the configured location and date. A photocell responds to ambient light.
Connected controls may provide app access, remote switching, or separate zones, but these functions vary by product.
Radar Lighting’s RTD transformer series lists Auto and Timed functions with a remote photocell. Confirm the available modes in the operating instructions.
For smart control, verify networking, offline schedules, timekeeping after an outage, account ownership, and ongoing software support. Do not assume every product offers dimming or voice integration.
Compare quotations using the same fixture schedule and installation requirements.
Include cable, connectors, controls, installation, energy use, maintenance, and replacement availability. A larger rating does not mean constant full-rated consumption, but different products can have different losses at the same load.
Request:
Current technical and installation documents.
Circuit, terminal, and compatibility information.
Relevant product documentation for the destination.
Warranty coverage and exclusions.
Approved replacement accessories.
Service contacts and claim procedures.
Verify the system with the intended lights operating.
Check source output, representative fixture inputs, and circuit loading using a suitable instrument and the approved procedure. Confirm that nearby and distant lights remain within their specifications.
Test control schedules, overrides, and any independent zones. Record cable routes, fixture loads, tap assignments, and measured results.
Contact Radar Lighting with your fixture schedule, cable plan, supply information, operating schedule, and expansion requirements to discuss an appropriate transformer configuration.
Start with the connected products’ electrical data, then check circuit limits, installation conditions, and required allowances. Include defined future additions rather than selecting by property size alone.
Possibly, if the product supports that load and the output remains compatible. Check minimum-load requirements, controls, and fixture voltage.
It depends on the product. Some lamps and fixtures accept AC, some require DC, and others support both. Use the exact specification.
Only if it benefits the calculated layout or provides useful design flexibility. A suitable single-tap system can work correctly when fixture voltage remains acceptable.
No. Smart control determines operating behavior and may provide monitoring. Cable resistance, load distribution, connections, and output settings still require proper design.
