Selectable Wattage High Bay Settings Guide

The wattage selector on a high bay is not a “set it to maximum and forget it” switch. It is a commissioning tool. The right setting is the lowest available setting that still satisfies the approved lighting criteria for the actual work area—including horizontal illuminance, vertical visibility, uniformity, and any task-specific requirements.

That distinction matters in warehouses with mixed ceiling heights, rack aisles, open staging areas, and work cells. Two fixtures from the same product family may need different settings because their zones do different jobs.

Practical rule: Use the photometric plan to choose the initial setting, verify the installed result with appropriate measurements, change only one variable at a time, and record the final setting. Do not reduce wattage only to reach an energy target if the lighting criteria no longer pass.

What the selector changes—and what it does not

A selectable-wattage fixture offers several fixed input-power levels within one product. Moving to a lower position reduces input power and available light output. It does not correct poor fixture spacing, the wrong optic, blocked light between tall racks, or an unsuitable mounting location.

The wattage selector is also different from a 0–10V dimming control. Think of the selector as establishing the fixture's available power range for the application; dimming is an operating control used after the system has been designed and wired for it. Exact behavior and compatibility are model-specific, so the product instructions and control documentation remain the authority.

Safety: Selector changes and electrical work should be performed only with power isolated, by a qualified person, and in accordance with the instructions for the exact fixture and applicable codes.

Read the actual wattage steps, not just the percentages

The current YXL High Bay LED Lights product page lists 150W, 200W, and 240W variants with selectable output. The associated series manual gives the following actual wattage positions:

Fixture member	High setting	Middle setting	Low setting	Maximum listed lumens
150W member	150W	120W	90W	22,500 lm
200W member	200W	160W	120W	30,000 lm
240W member	240W	190W	140W	36,000 lm

Notice that the 240W member's middle and low positions are listed as 190W and 140W. Those are the numbers to use in an energy estimate—not assumed mathematical percentages. “Maximum lumens” describes the highest listed output for the member; it should not be treated as the measured output at every selector position.

Choose a provisional setting before installation

A useful starting setting comes from the lighting layout—not a mounting-height chart alone. The calculation should reflect ceiling height, fixture spacing, room dimensions, surface reflectance, rack geometry, optic or beam distribution, light-loss assumptions, and the required light level for the work.

For a simple open area, one setting may work across the room. A racked warehouse often needs zone-by-zone decisions:

Rack aisles: Vertical visibility on labels and shelf faces can matter as much as readings on the floor.
Open staging: Wider spacing and changing pallet positions may make uniformity the limiting factor.
Packing or inspection: Detailed visual work may require a different criterion from general circulation.
Low-traffic storage: Controls may produce better savings than permanently under-lighting the area.

If the project does not yet have a layout, gather the room dimensions, mounting height, rack plan, task descriptions, working-plane height, operating schedule, and target criteria before selecting a final wattage. YXL's Lighting Design service can use project information to support that step.

A five-step process for setting the fixtures

Divide the facility into real operating zones. Do not average receiving, rack aisles, packing, and cold-storage doors into one decision.
Set the provisional position from the approved layout. Record the model, optic, mounting height, spacing, and starting wattage.
Evaluate the installed system under representative conditions. Use suitable, calibrated instruments and the measurement grid required by the project's criteria. Check more than a single bright point directly below a fixture.
Change one step at a time. If a zone comfortably meets all criteria, an authorized reviewer may evaluate the next lower position. Re-measure after the change.
Document the accepted setting. Keep the record with the panel schedule, lighting plan, controls documentation, and maintenance information.

A common mistake: A good average reading can hide dark shelf faces or poor uniformity. Before accepting a lower setting, inspect the places where people actually read labels, move equipment, load trailers, or perform quality checks.

Calculate the energy difference before discussing savings

The basic annual energy calculation is:

Annual kWh = fixture quantity × input kW × annual operating hours

Assume a zone has 40 fixtures from the 200W member and operates 4,000 hours per year. This example isolates the wattage setting; it does not include sensor behavior, dimming schedules, demand charges, taxes, or maintenance.

Selector position	Input used	Calculation	Annual energy	Difference from 200W
High	0.200 kW	40 × 0.200 × 4,000	32,000 kWh	Baseline
Middle	0.160 kW	40 × 0.160 × 4,000	25,600 kWh	6,400 kWh less
Low	0.120 kW	40 × 0.120 × 4,000	19,200 kWh	12,800 kWh less

To estimate utility cost, multiply the kWh difference by the facility's applicable energy rate. Use the actual bill or tariff rather than a national average. The calculation shows potential energy use; it does not prove that the lower setting provides acceptable lighting.

When not to turn the output down

The lower setting fails the project's maintained illuminance or uniformity criterion.
Rack faces, vertical labels, or work surfaces become difficult to see even though the floor average looks acceptable.
Forklift intersections, loading edges, stairs, inspection stations, or other critical locations lose needed visibility.
The design relies on an incorrect optic, excessive spacing, or a fixture count that cannot be corrected by selector changes.
The measurement was taken before racks and inventory were in a representative position.
The proposed setting conflicts with the approved design, local requirements, insurer requirements, or the authority having jurisdiction.

There is no prize for choosing the lowest possible setting on day one. Selectable wattage is valuable because it leaves a controlled adjustment range for real field conditions. That flexibility is most useful when the final decision is measured and documented.

Use a zone-level commissioning record

A short handoff record prevents a future technician from finding mixed selector positions with no explanation. Copy this structure into the commissioning report:

Zone	Fixture/model	Design setting	Conditions checked	Final setting	Reviewer/date
Rack aisle A	Enter exact SKU	Enter watts	Horizontal, vertical, uniformity	Enter watts	Name/date
Packing zone	Enter exact SKU	Enter watts	Task plane, glare, uniformity	Enter watts	Name/date

For a new warehouse or retrofit, send YXL the floor plan, ceiling and mounting heights, rack dimensions, task areas, operating schedule, and target lighting criteria. That information is more useful than square footage alone when comparing selectable-wattage LED high bays.

Final takeaway

Select the initial wattage from a defensible lighting layout, not habit. After installation, evaluate each operating zone, reduce output only when all relevant criteria still pass, and leave a clear record. Used this way, selectable wattage is not a marketing checkbox—it is practical commissioning flexibility.