When an arc curing lamp goes dark mid-shift, the question on the floor is not “what is a UV bulb?” but “which bulb does this lamp take, and do we have one?” Answering that in under a minute depends on work done long before the lamp failed.
Q: How Do You Identify the Correct Replacement UV Bulb for a Curing Lamp?
A: Start From the Lamp’s Model Number, Then Map It to One Part Number
Wattage alone does not identify a bulb. Two bulbs with the same wattage can have different fill chemistry and spectral output, and a cure schedule is qualified against one specific spectrum. Incure maps each replacement bulb to a specific lamp model, so the identification path is: read the lamp model, find its single matching part number, and confirm any spectral choice the lamp family offers. This article turns that path into a worksheet a maintenance team can fill in once per lamp and reuse.
Step 1: Record Every Arc Lamp by Model and Configuration
Walk the floor and list each arc lamp with its model number, its configuration, its location, and the process it runs. The model plate on the controller is the reliable source; handwritten labels on bulb housings are not. For Incure equipment, this step separates the two arc lamp families that use replacement bulbs: the S20™ UV spot curing system and the F-Series™ UV flood curing system.
Step 2: Map Each Lamp to Its Part Number
Incure’s replacement bulb line uses four part numbers, each tied to one lamp model:
| Lamp family | Part number | Bulb |
|---|---|---|
| S20™ spot | 282008 | 100W short arc mercury |
| S20™ spot | 282068 | 200W short arc mercury |
| F-Series™ flood | 282047 | 400W mercury |
| F-Series™ flood | 282021 | 400W metal halide |
On the S20™, the choice between the 100W and 200W bulb depends on which configuration is installed, so the worksheet should record the configuration, not just “S20™.” On the F-Series™, both bulbs are 400W, which is exactly why wattage cannot be the identifier there.
Step 3: Resolve the Mercury or Metal Halide Choice for Flood Lamps
The two F-Series™ bulbs share a wattage but not a spectrum. Standard mercury arc lamps emit broadband UV with strong peaks at 254, 313, 365, and 405 nm. Metal halide lamps add halide salts to the fill, shifting and boosting output in the 365–405 nm UVA range at the same wattage. Record which one the process was qualified with. If the original qualification records are missing, check them against the adhesive or coating supplier’s cure wavelength before choosing, rather than defaulting to whichever bulb is in stock. Background on each lamp family is in Incure’s guides to the F-Series™ UV flood lamps and the S20™ spot lamp.
Email Us with your S20™ or F-Series™ model number and configuration, and Incure can confirm the matching bulb part number for your worksheet.
Step 4: Add Service Data to Each Row
Identification is more useful with context. For each lamp, add the installation date of the current bulb and the lamp’s operating hours if the controller tracks them. Arc mercury lamps are commonly replaced every 1,000–2,000 hours depending on duty cycle, and frequent start-stop thermal cycling accelerates decline. A row showing a bulb approaching that range tells the planner to have the matching spare on the shelf. Longer required cure times or incomplete cure at previously reliable settings are the early performance signs that a bulb is near the end of its useful life.
Step 5: Flag Substitution Risks on the Worksheet
Note on each row that substitution is not approved. Incure validates each bulb for the Incure system it is paired with; fitting a generic lamp into an Incure system, or an Incure bulb into third-party equipment, breaks that validated irradiance match even when the wattage agrees on paper. Arc geometry, fill chemistry, and electrode configuration all affect spectral output. A worksheet line that says “282068 only” prevents a well-meaning substitution on a night shift.
Step 6: Keep the Worksheet Where the Lamp Is
A worksheet in a shared drive helps the planner; a copy posted near each lamp helps the technician. Include the part number, the bulb type, the configuration, and a reminder of the handling basics: allow the old lamp to cool fully before removal (about 30 minutes after shutoff), wear UV-protective goggles, and never touch the quartz envelope with bare hands.
A Hypothetical Completed Row
A hypothetical entry might read: “Line 2 bench, S20™ 200W configuration, bulb 282068, installed on a recorded date, process qualified on mercury spectrum, spare on shelf: yes.” Every field answers a question someone would otherwise have to look up during downtime. For the lamp-side reasons a bulb may fail early, see Incure’s article on why a UV bulb keeps blowing, and for the full replacement line, Incure’s guide to matching replacement bulbs to lamp models.
Contact Our Team to confirm the replacement UV bulb for each Incure curing lamp on your floor.
Visit www.incurelab.com for more information.