Light guides are usually discussed as if they were independent of the lamp behind them. In practice the lamp type decides most of the guide choice before anyone compares diameters, because an arc source and an LED source ask very different things of the optical path.
Q: Does a UV Curing Light Guide Differ Between LED and Arc Spot Lamps?
A: Yes — the Lamp Sets the Construction, Spectrum, and Test Method
Incure’s arc spot lamp, the S20™, pairs with liquid lightguides in 1- to 4-pole configurations, while Incure’s L9000™ UV LED spot lamp pairs with fiber-construction guides in three lengths. The guide has to carry the lamp’s spectrum without degrading, fit the lamp’s port, and suit the lamp’s thermal and duty behavior. Choosing a guide therefore starts with the question “which lamp?” rather than “which guide?” The sections below compare the two paths side by side.
What an Arc Lamp Puts Into the Guide
The Incure S20™ UV arc spot lamp uses a 200W mercury arc and delivers peak output above 21 W/cm² (up to 23 W/cm²) at the lightguide tip across a 275–650 nm spectrum. That breadth is why arc lamps suit almost any photoinitiator chemistry, and it is also why the guide’s spectral rating matters: a guide not rated for the light source’s wavelengths degrades rapidly and gives poor process results. Liquid light guides fit this role because their large, continuous core transmits more light energy than a comparable fiber bundle and gives a uniform output without the “honeycomb” pattern a bundle can show.
What an LED Lamp Puts Into the Guide
The Incure L9000™ UV LED spot lamp is factory-configured to a single wavelength chosen from 365, 375, 385, 395, or 405 nm. Its guides are fiber construction: the Cool Guide (L9000-CG, 83 mm total length with a 24 mm cube head and an integrated cooling fan), the Short Guide (L9000-SG, 66 mm), and the Long Guide (L9000-LG, 118 mm). Glass fiber guides tolerate higher temperatures than liquid guides, resist degradation under sustained UV better, and support tighter bend radii, which suits the compact fixture positions an LED spot lamp is often mounted in. Because the wavelength is fixed per unit, the guide never has to cover a broad spectrum, but the adhesive must match that one wavelength.
Duty Cycle Changes How the Guide Is Used
The two lamps behave differently over a shift, and that affects the guide. The S20™ needs 1–2 minutes to reach full intensity and a cooldown before restart, so it is usually left running while its 1–99 second timer controls exposure. Its rated lamp life is 2,000+ hours. The L9000™ fires at full intensity on the first trigger with no warm-up, is rated at 15,000 hours with less than 20% intensity decay across that span, and can be triggered by a PLC over RS-232. An arc guide therefore sees long continuous exposure, while an LED guide sees short repeated pulses, and both conditions are worth stating when a guide is specified.
Email Us with your lamp model, adhesive cure wavelength, and fixture layout, and Incure can confirm the matching guide construction and length.
Multi-Point Curing on Each Platform
Both platforms can cure more than one point at a time, but they get there differently. On the S20™, the pole count is built into the liquid guide: S20-1P through S20-4P split one arc lamp’s output across one to four simultaneous tips. On the L9000™, up to four independent lightguides run from a single controller. The planning question is the same for both, namely how many bond points the fixture has, but the part ordered differs.
Verifying the Guide in Service
Verification tools also follow the lamp type. Incure’s LS217™ Lightguide Simulator uses a Standard D, Ø5mm connection and is built for mercury arc, xenon, and halogen spot lamps such as the S20™; it is not intended for LED spot sources with a different port geometry. On an LED lamp, a radiometer reading at the guide tip is the practical check. In both cases the reading belongs at the delivery end, because a guide can lose transmission while the lamp itself performs as rated.
Tip Hardware Works Across Both
One area where the platforms converge is tip geometry. Incure’s LGT-Series™ terminators, which redirect output at 90° or 60° in Ø5mm and Ø8mm apertures, are built around the LLG-1P-5 and LLG-1P-8 liquid guide cores used with the S20™ and also suit compatible L9000™ fiber guide configurations.
A Short Decision Path
- Choose the lamp by the adhesive: broadband arc output for mixed or unknown chemistries, a single LED wavelength when the adhesive’s peak is known.
- Take the guide construction that lamp is built around: liquid for the S20™, fiber for the L9000™.
- Set pole or guide count from the fixture’s bond points.
- Set length from reach, and add terminators where the bond face is angled.
For a material-level comparison of the two constructions, Incure’s article on liquid versus fiber optic light guide pros and cons goes further.
Contact Our Team to pair a UV curing light guide with the right Incure spot lamp.
Visit www.incurelab.com for more information.