An irradiance spec on a datasheet is only as good as the light source it was measured with — change the lamp and the number on the page stops describing what’s actually happening at the curing area.
The Reference Lamp for F-Series™ Performance Data
The Incure 282021, one model in the Incure UV Curing Replacement Bulbs lineup, is the factory-installed 400W metal halide lamp for the F-Series™ UV arc flood curing systems, including the F100 and F400. Every published F-Series™ irradiance rating — 225 mW/cm² for the F100, 490 mW/cm² for the F400 — was measured and characterised against this specific lamp. Installing the 282021 as a replacement delivers the rated intensity the datasheet specifies; substituting a different lamp type changes the spectral distribution and means the published specification can no longer be relied on without a new irradiance measurement.
Metal Halide Dopants Shift Output Toward UVA
A standard 400W mercury arc distributes output across 254 nm, 313 nm, 365 nm, and 405 nm. Most UV adhesive photoinitiators absorb in the 365–400 nm band — output at 254 nm and 313 nm heats the assembly without advancing the cure. Metal halide dopants shift the 282021’s arc output into the UVA range, so more of the 400W reaches the bond line as usable curing energy. In practice that means shorter cure times and lower part temperatures than an equivalent-wattage mercury arc lamp delivers for the same UVA-formulated adhesive.
No UVC Emission
The mercury-arc alternative (282047) produces genuine UVC radiation at 254 nm, which triggers UVC-rated ventilation and extended PPE requirements in regulated facilities. The 282021 produces none — the same F-Series™ cure performance without that additional compliance layer. Where facility or process rules can’t accommodate UVC, or where the ventilation overhead isn’t justified for a UVA-qualified adhesive, the 282021 is the standard choice, not an exception.
If your F-Series™ cure schedule was originally qualified against a mercury-arc lamp rather than metal halide, switching lamp types changes the spectral input enough to require re-qualification — Email Us to confirm which lamp your process was validated against before ordering.
Warm-Up Time and Replacement Interval
Rated lamp life is approximately 2,000 hours under standard conditions, with output loss progressive rather than sudden — schedule replacement at the rated interval based on cumulative hours instead of waiting for visible failure. Allow 2–3 minutes of warm-up before starting a cure cycle so the arc reaches full operating temperature and irradiance stabilises; after shutoff, allow a minimum 30-minute cooldown before handling, and never touch the quartz envelope with bare hands.
A flood lamp is only one variable in curing-area intensity — reflector condition, working distance, and eye protection all shift the delivered dose from the same rated Incure lamp. Review the Incure F-Series™ UV Arc Flood Lamps this bulb powers, and confirm your team’s Incure Vison™ eyewear is rated for F-Series™ output.
Two Systems, One Lamp
The 282021 is the compatible replacement lamp for both the F100 and F400 flood curing systems — the same part number covers either model, simplifying spares inventory for a line running both together. Its rated life of approximately 2,000 hours is double the roughly 1,000-hour rating of the S20™ spot curing system’s short arc mercury lamps, reflecting the different duty profile of a flood system that typically runs longer, lower-intensity-per-unit-area cure cycles across a wider footprint rather than short, concentrated spot exposures.
Confirming Fit Beyond the Lamp Itself
A lamp swap is also a reasonable point to check the F-Series™ reflector for dust buildup or discoloration, since a degraded reflector reduces delivered irradiance independent of a correctly functioning lamp, and to confirm the working distance between the lamp housing and the part hasn’t drifted from what the original F-Series™ intensity rating assumed. Both factors affect the actual dose reaching the curing area as much as lamp condition does, and neither shows up as an obvious symptom until a batch fails downstream inspection.
Why the Mercury Alternative Still Exists
If the 282021 delivers more useful curing energy and removes UVC compliance overhead, it’s worth asking why the broadband mercury option (282047) is still offered at all. The answer is qualification history: many adhesive formulations, especially older or third-party products, were originally validated against broadband mercury arc output rather than metal halide. Switching an already-qualified line to metal halide changes the spectral input enough to require re-testing, even though the metal halide lamp is the better-performing option for a UVA-formulated adhesive being qualified fresh. For a new process being specified from scratch, the 282021 is the default starting point; for an existing line with mercury-qualified history, that history is worth checking before assuming a lamp swap is a simple upgrade.
For a full review of your F-Series™ setup, Contact Our Team.
Visit www.incurelab.com for more information.