Converting a UV Flood Curing System From Arc to LED — A Decision Guide for Existing Lines

A line that already cures under an arc flood lamp has something a new line doesn’t: a qualified process. That makes the arc-versus-LED question less about which technology is better in general and more about what would have to change, and be re-proven, if the station switched.

Q: Should an existing arc UV flood curing system be replaced with LED?

A: Only if the material cures at an LED wavelength and the gains, such as instant start, no bulbs, and higher intensity at comparable areas, outweigh re-qualification and the hardware that changes with the lamp. If the material depends on broadband UVA, UVB, or visible output, staying with arc is often the sound decision.

Start With the Material, Not the Lamp

An arc lamp such as Incure’s F-Series™ emits UVA and UVB, with several models adding visible output. An LED flood lamp emits a single narrow band, and Incure’s L-Series™ units are each factory-configured to one wavelength: 365, 385, 395, or 405 nm. The first question is therefore whether the material’s data sheet supports curing at one of those wavelengths. If it doesn’t, the conversion stops here, or it becomes a material change as well as a lamp change.

Finding a Comparable Curing Area

The next step is matching the field the line already uses. Some approximate pairings:

Existing arc model	Arc field	LED candidate	LED field
F400 / F500	5″×5″	L64 or L88	6″×4″ or 8″×8″
F900P	16″×12″	L1414	14″×14″

None is a perfect match. The L44’s 4″×4″ field is smaller than 5″×5″, so a part that fills the F500’s field needs the L88. The F900P’s 192 square inches is close to the L1414’s 196, but the F900P’s 16-inch side does not fit inside a 14-inch field, so long parts may need indexing or a different layout.

Comparing Intensity Carefully

Incure quotes the F500 at 590 mW/cm² of UVA at 2.0 inches and the L88 at 1,900 mW/cm² at 2 inches. On paper, that is about 3.2 times higher. In practice, a narrow-band LED reading and a broadband arc UVA reading are not directly interchangeable, because the material responds to how much of that output falls inside its absorption range. Treat the ratio as a reason to test, not as a cure-time prediction. Measure both lamps at the production distance with a radiometer suited to each, and cure samples under both.

Email Us with your current F-Series™ model, material data sheet, and cycle time, and Incure’s engineers can identify an LED candidate and a test plan.

What Changes Besides the Lamp

A conversion touches more than the light source:

Enclosure. Arc lamps pair with B-Series™ chambers; LED lamps with C-Series™. A B500 or B201 will not carry over.
Control signals. B-Series™ chambers take PC, PLC, and foot-pedal input through dual D-sub; L-Series™ lamps and C-Series™ chambers take foot-switch, PLC, and RS232. PLC logic and wiring need review.
Interlock behavior. B-Series™ doors close a shutter; C-Series™ drawers cut lamp power.
Shielding. Incure’s Perimeter™ shield fits the F-Series™ stand; an LED station needs its own containment plan.
Maintenance. Bulb stocking and the 30-minute cooldown before changes disappear; bulb disposal under mercury waste rules ends.

What the Line Gains

Instant start. Arc lamps need several minutes to stabilize; LED reaches full output at switch-on, which matters most on stop-start lines.
No bulb replacement window. Arc bulbs are commonly replaced every 1,000 to 2,000 hours.
Upgrade headroom. If more intensity is needed later at 4″×4″ or 12″×12″, Incure’s water-cooled W-Series™ fits the same C-Series™ chambers as the L44 and L1212.

What the Line Risks

Re-qualification of every material and product cured at the station
Spectrum loss for any material relying on UVB or visible output
Field fit where the LED field differs in shape from the arc field
Downtime during changeover and validation

When Staying With Arc Is the Right Call

Keeping the arc station is reasonable when any material on the line depends on UVB or visible output, when the station runs long continuous cycles where warm-up happens once a day rather than every few minutes, or when a large F900P installation inside a B201 or over a conveyor is already qualified and performing. In those cases, investing in bulb planning and a regular radiometer check can deliver more value than a conversion that has to re-prove every product.

A Practical Sequence

Confirm each material supports an available LED wavelength.
Choose the LED model whose field contains the largest part.
Cure samples under both lamps and compare test results.
Map the LED field at production distance and set exposure from the weakest point.
Plan the chamber, control, and shielding changes.
Re-qualify, then switch.

Running the new station beside the old one during qualification avoids betting production on the first trial.