Ushio USH-350DS

is a 350 W super-high-pressure (USH) mercury short-arc lamp engineered for high-luminance UV/visible output with a compact arc for precise illumination. Its tightly confined plasma and stable arc deliver reliable, repeatable irradiance for critical optical processes. Typical service life of 1000 hours (application/drive-condition dependent). Common cross-references include Osram's HBO 350 W//S (69228). Designed for vertical operation (±45°) with forced cooling and constant-power drive, the USH-350DS supports applications from fluorescence microscopy to spot UV curing and mask aligner exposures.

Applications

• Fluorescence microscopy & epi-illumination — high luminance at key mercury lines for excitation.
• Spot UV curing — stable UV output for bonding, encapsulation, and coatings.
• Light-guide systems — efficient coupling into fiber/light pipes. 
• Schlieren/inspection optics — point-like source for high-contrast imaging.

Semiconductor / Lithography

• Mask aligners (e.g., Karl Suss MJB/MA series) and UV exposure tools. 

Life Sciences / Research

• Fluorescence and UV transillumination where mercury spectral peaks are required.

Industrial UV Processing

• Adhesive/die attach curing, conformal coat touch-ups, optical assembly.

Features

• High luminance, small arc — concentrates UV/visible energy into a tight spot for efficient coupling and sharp, uniform fields. 
• Stable output over life — constant-power drive with low ripple (≤3% p-p) supports consistent process results and exposure dose control.

• Engineered for reliability — enhanced electrode design and controlled manufacturing extend useful life when operated within specified thermal limits.
• Designed for integration — vertical (±45°) operation, forced-air cooling, and standard threaded end fittings simplify lamphouse alignment and maintenance. 

Specifications

All values per the official Ushio USH-350DS datasheet unless noted.

Cross-reference and retail naming examples shown for buyer orientation. 

FAQs

• How should I drive this lamp for stable output?
  Use a constant-power supply with ≤3% ripple and ≥4 kV DC trigger. Maintain adequate cooling and avoid frequent on/off cycling to preserve life. Use only the OEM equipment manufacturer's replacement parts for any power supply and ignitor maintenance or repairs.
• What mounting orientation is recommended?
  Vertical operation within ±45° is specified. Follow your OEM equipment manufacturer's instructions for alignment and clamping torque. 
• What cooling and temperatures are acceptable?
  Forced cooling is required. Keep base ≤200 °C; typical bulb temperature is 650–750 °C during operation. 
• Is the USH-350DS equivalent to OSRAM HBO 350 W/S?
  It is commonly cross-referenced in the market; always confirm pinning, LCL, and lamphouse fit before substitution. 
• Does it contain mercury?
  Yes. Handle as a high-pressure Hg source; follow disposal regulations and safety guidance in the datasheet. 

Warranty

High-pressure short-arc lamps are consumables. Standard coverage is limited to manufacturing defects upon receipt/installation; damage from mishandling, improper cooling, poor equipment maintenance and drive conditions is excluded. 

Ordering and Quotes

SKU# USH 5000508 — Ushio USH-350DS, 350 W. Click Add to Cart for fast checkout or request a quote at sales@sciencelighting.com for volume discount orders and scheduled replacements.