Ushio USH-350DP, (P/N 5000506)

is a 350 W super high-pressure short-arc mercury UV lamp engineered for high luminance, stable arc performance, and long service life in precision optical systems. Designed for constant-power operation with low ripple, the USH-350DP delivers strong UV output and a tightly confined arc for efficient coupling into microscope illuminators, fiber-optic light guides, and spot UV curing optics. A 2.8 mm cold arc gap, vertical ±45° burning position, and manufacturer-rated 1,000-hour typical life support repeatable process results and lower downtime. Forced cooling is required; maximum base temperature is 200°C with a typical bulb temperature of 650–750°C. Total luminous flux is specified at 22100 lumens with published UV intensity data around 360–370 nm for applications that demand reliable, high-contrast illumination.

Applications

Microscopy & Imaging

• Fluorescence microscope illumination requiring high luminance and arc stability. 

Electronics Manufacturing

• GCA/Cobilt wafer stepper using g-line (436nm) or i-line (365 nm) step and repeat exposure tools for silicon wafer lithography such as GCA 6300. 

Analytical & Life Sciences

• Light-guide based sources in diagnostic and analytical instruments needing stable, repeatable UV output. 

R&D, Inspection & Metrology

• Schlieren method and general inspection tasks demanding a compact, intense point source. 

Features

• Ultra-stable arc for precise results: Enhanced electrode design supports precise arc positioning and stability - critical for imaging uniformity and repeatable measurements. 
• High usable UV output: Short-arc mercury spectrum with published UV intensity around 360–370 nm enables efficient excitation and curing. 

• Long service life: Improved manufacturing processes yield a typical 1,000-hour average life to 70% intensity (application dependent), reducing changeouts. 
• Integration-friendly: Vertical ±45° operation and 8-32 UNC terminals suit many lamp houses and fixtures. 
• Quality assured: Manufactured under tightly controlled ISO quality processes. 

Specifications

Dimensions

FAQs

Q1: What power supply is required?
A: Use a constant-power lamp supply with ≤ 3% p-p current ripple and a minimum 4 kV DC trigger. The PSU input should be at least 120 V. This helps ensure stable arc performance and lamp life. 

Q2: Can I run this lamp horizontally?
A: The specified burning position is vertical with ±45° tolerance. Operating outside this range may affect stability and lifetime. 

Q3: What lifetime should I expect?
A: Typical average life is 1,000 hours under proper conditions (cooling, ripple control, limited on/off cycling). Frequent switching or inadequate cooling can shorten life. 

Q4: Is forced cooling necessary?
A: Yes. Forced cooling is required, with maximum base temperature 200 °C and typical bulb temperature 650–750°C.

Q5: How much UV/visible output does it provide?
A: Total luminous flux is specified at 22100 lm (visible light), with published horizontal intensity of ~148 µW/cm² at 360–370 nm measured at 1 m.

Q6: Does it contain mercury, and how should I dispose of it?
A: Yes—this is a mercury short-arc lamp. Follow Ushio’s lamp safety guidance and all local regulations for handling and disposal. 

Warranty

Covered by a limited manufacturer warranty against defects in materials and workmanship. To initiate support contact ScienceLighting Customer Support at info@sciencelighting.com with your order number and lamp details. 

Ordering

Ready to upgrade or replace your short-arc mercury source? Add the Ushio USH-350DP (5000506) to your cart for fast, careful shipment in shock-resistant packaging. For integration questions (lamp house, PSU compatibility, cooling), our team can help ensure a smooth install and optimal life. We recommend keeping a spare on hand to prevent unplanned downtime. Click “Add to Cart” to purchase now.