UV LED Flood Lamp Wavelength — Choosing 365, 385, 395, or 405 nm Before You Order
The wavelength on a UV LED flood lamp is the one specification that cannot be corrected after installation, which makes it the decision most worth slowing down for. Get it right on paper first, and every later choice gets easier. Q: Which wavelength should a UV LED flood lamp use? A: The wavelength that falls inside the photoinitiator absorption range stated on the adhesive or coating's technical data sheet. Incure's L-Series™ and W-Series™ flood lamps are each offered in 365, 385, 395, or 405 nm, and each unit ships factory-configured to one of them. If a line runs several materials, the chosen wavelength has to suit all of them, or the line needs more than one lamp. Why the Choice Is Permanent Unlike a mercury-arc flood lamp, whose bulb emits a broad spectrum, an LED flood lamp emits a single narrow band set by the diodes in its array. Incure configures that band at the factory. There is no field switch and no swappable filter, so a lamp ordered at 395 nm stays a 395 nm lamp. A wavelength mismatch discovered during qualification means replacing the unit, not adjusting it. A Four-Step Wavelength Decision Read the data sheet for every material the lamp will cure, not just the first one. Note the stated cure wavelength or range and the required dose. Find the overlap. If every material lists a range that includes, for example, 385 nm, one lamp serves the whole line. Check intensity at that wavelength. Intensity is not uniform across the four options. On L88 through L1414, the 365 nm version runs measurably lower than the 385, 395, and 405 nm versions. On the W-Series™, the pattern reverses: W44 and W1212 read higher at 365 nm. Confirm with a cured sample at the chosen wavelength and production working distance before the order is final. Email Us with the data sheets for every material on your line, and Incure's engineers can identify which wavelength, if any, covers all of them. Same Model, Different Wavelength, Different Exposure Time Because intensity shifts with wavelength on several models, the same material can need a different exposure time on two lamps with identical curing areas. Consider a hypothetical material that cures at both 365 nm and 395 nm. If one wavelength version of a lamp delivers 20 percent less irradiance than the other, the exposure needed for the same dose rises by a factor of 1 ÷ 0.8, or 25 percent. The 20 percent figure here is illustrative; take the real intensity for each wavelength from the model's specification sheet and recalculate the cure schedule rather than reusing one written for another wavelength. Mixed-Material Lines When no single wavelength suits every material, there are three workable paths: Standardize materials around one wavelength during process development, so one lamp serves the line. Dedicate lamps — one L-Series™ unit per wavelength, each at its own station. Every model accepts foot-switch, PLC, and RS232 inputs, so multiple lamps can share one control scheme. Use broadband exposure…