SONNTEK LH-42 Deuterium Lamp

The Sonntek LH-42 Deuterium Lamp is a deuterium (D2) ultraviolet lamp packaged as a lamp-and-holder assembly in Sonntek's LH-series, designed to serve as a ready-to-install UV light source for spectrophotometer detectors, UV detectors, and other UV measurement modules that accept Sonntek LH replacements. As a D2 lamp, it delivers a continuous ultraviolet emission across the UV spectrum, making it suitable for wavelength calibration, detector response verification, spectral scans, and UV-only photometric measurements in instruments that use Sonntek LH-series lamps. The LH designation indicates the lamp ships with its compatible holder, simplifying installation and ensuring alignment within instrument bays that specify Sonntek LH parts. Sonntek's 2025 lamp-guide catalog confirms LH-42 as a D2 entry in the LH family, reinforcing its role as a direct replacement component across multiple detector systems that rely on Sonntek UV lamp technology.