Amalgam UVC Germicidal Lamp | 42–500W High Output, 13,000h Rated Life

Product Overview

The Legia Smart amalgam UVC lamp series is engineered for one job: delivering maximum germicidal UV-C output per lamp, sustained over the longest possible service interval. Unlike standard low-pressure mercury lamps whose output peaks at a single, narrow operating point, amalgam technology stabilizes the mercury vapor pressure inside the arc tube across a wide thermal window — keeping 254nm output above 85% of nominal from roughly 10°C to 60°C ambient. For system designers building municipal water treatment trains, wastewater reuse plants, or aquaculture disinfection loops where lamp wells run hot and flow rates fluctuate, that stability is the difference between a validated dose and a guessing game.

Every lamp in the series is built on high-purity quartz glass with a proprietary doping and coating process. The quartz is treated to reduce impurity content, which keeps solarization — the gradual UV-induced darkening that strangles output in ordinary tubes — to a minimum. The result is a rated life of 13,000 hours with UVC output maintenance of approximately 85% at end of life, versus the 60-70% typical of non-coated economy lamps at 9,000 hours. Fewer lamp change-outs per year means lower maintenance labor, fewer reactor shutdowns, and a lower total cost of ownership across the system’s life.

The series spans three tube diameters and four electrical classes: T5 (15mm) lamps from 42W to 190W, T6 (19mm) lamps from 57W to 320W, and T10 (32mm) high-power lamps reaching 500W and 1,300 μW/cm² at one meter — among the highest single-lamp UVC intensities available in a low-pressure format. Horizontal-only (GPHA/GPHHA) and universal horizontal/vertical (GPHVA) installation variants let OEMs match the lamp to the reactor geometry without compromising output.

Amalgam Long-Life Technology

A conventional low-pressure UVC lamp contains a droplet of pure liquid mercury. Its vapor pressure — and therefore its UV output — is exquisitely sensitive to the cold-spot temperature of the tube wall: a few degrees too cold and output collapses; a few degrees too hot and the 254nm line self-absorbs. Amalgam lamps replace the liquid droplet with a solid mercury alloy (typically indium- or bismuth-based) that regulates mercury vapor pressure over a broad temperature band. The Legia Smart amalgam series holds 85-100% of peak UVC output across a 10–60°C operating window, with the peak plateau centered near 30-40°C — exactly where submerged water-treatment lamps and in-duct air lamps actually run.

Two further process technologies protect that output over time. First, the internal protective coating on the quartz wall blocks the chemical reactions that cause mercury to bind with the glass and that allow solarization to cloud the arc path — this is what keeps end-of-life output at ~85% instead of ~60%. Second, the cathode is a proprietary filament design with an emitter coating engineered for tens of thousands of on/off cycles, so systems with flow-paced or intermittent dosing do not pay a life penalty.

Core Advantages

• 13,000-Hour Rated Life with ~85% End-of-Life Output — Why It Matters: Most municipal and industrial UV validation protocols size the reactor around end-of-life lamp output. A lamp that retains 85% at 13,000 hours lets you design with a smaller safety margin, run longer between change-outs, and cut annual lamp consumption by roughly a third versus 9,000-hour standard-output lamps.
• Stable Output from 10°C to 60°C — Why It Matters: In water treatment, lamp-wall temperature swings with flow rate and inlet temperature; in air ducts, with season and fan speed. Pure-mercury lamps can lose 30-50% of their dose outside their narrow optimum. Amalgam regulation holds the dose steady, which is what keeps a validated disinfection log defensible during audits.
• Up to 1,300 μW/cm² at 1m (T10 Class) — Why It Matters: Higher intensity per lamp means fewer lamps, shorter reactors, and smaller pressure vessels for the same validated dose. For OEMs, that is steel, welds, and shipping volume removed from every system sold.
• High-Purity Quartz with Anti-Solarization Coating — Why It Matters: Impurities in ordinary quartz absorb 254nm photons and darken with exposure. High-purity, coated quartz keeps transmission high for the full rated life — the decay curve stays flat instead of sliding.
• Ozone-Free or Ozone-Generating (185nm) Versions — Why It Matters: The same lamp family can be ordered in ozone-free quartz for pure germicidal duty, or in 185nm-transmitting quartz where combined UV+ozone oxidation is required for TOC reduction or odor control — one mechanical platform, two process options.
• Matching Quartz Sleeves and Electronic Ballasts Available — Why It Matters: Sourcing lamp, sleeve, and ballast from one supplier eliminates the finger-pointing that plagues multi-vendor UV skids when output or lamp life underperforms.

Typical Applications

Municipal Drinking Water Treatment: High-intensity amalgam lamps are the standard light source in closed-vessel drinking water reactors, where validated 4-log virus and Giardia/Cryptosporidium inactivation credits depend on stable, high-output 254nm delivery.

Sewage & Wastewater Disinfection: Open-channel and closed-vessel wastewater systems use high-power amalgam lamps to meet fecal coliform discharge limits without chlorination and dechlorination chemical handling.

Ultrapure Water & TOC Reduction: In electronics and pharmaceutical UPW polishers, 185nm-capable amalgam lamps oxidize trace organic carbon, protecting downstream mixed-bed resins and point-of-use filters.

Aquaculture, Pools & Ballast Water: Fish farm intake and recirculation loops, swimming pool secondary disinfection, and ship ballast-water treatment systems all rely on amalgam lamps’ ability to hold dose in cold, variable-flow water.

OEM Replacement Lamps: The GPHA/GPHVA/GPHHA form factors are dimensionally interchangeable with the standard amalgam lamps used in major reactor brands — Legia Smart supplies direct-fit replacements with matching electrical and UV output characteristics.

Technical Specifications

Model	Installation	Tube Dia (mm)	Length (mm)	Arc Length (mm)	Power (W)	Current (A)	Voltage (V)	UVC Intensity (μW/cm²)	UVC Output (W)	Rated Life (h)
GPHA357T5L	Horizontal	15	357	278	42	1.2	36	110	11	13,000
GPHVA357T5L	Horizontal/Vertical	15	357	278	42	1.2	36	115	11	13,000
GPHA436T5L	Horizontal	15	436	357	52	1.2	44	130	14	13,000
GPHA843T5L	Horizontal	15	843	764	105	1.2	88	320	35	13,000
GPHVA843T5L	Horizontal/Vertical	15	843	764	105	1.2	88	320	35	13,000
GPHA1000T5L	Horizontal	15	1000	921	127	1.2	107	370	42	13,000
GPHVA1000T5L	Horizontal/Vertical	15	1000	921	127	1.2	107	370	42	13,000
GPHA1554T5L	Horizontal	15	1554	1475	190	1.2	164	500	68	13,000
GPHVA1554T5L	Horizontal/Vertical	15	1554	1475	190	1.2	164	500	68	13,000
GPHA357T6L	Horizontal	19	357	278	57	1.8	32	130	13	13,000
GPHVA357T6L	Horizontal/Vertical	19	357	278	57	1.8	32	130	13	13,000
GPHA843T6L	Horizontal	19	843	764	127	1.8	71	400	43	13,000
GPHVA843T6L	Horizontal/Vertical	19	843	764	127	1.8	71	400	43	13,000
GPHA1000T6L	Horizontal	19	1000	921	150	1.8	84	460	52	13,000
GPHVA1000T6L	Horizontal/Vertical	19	1000	921	150	1.8	84	460	52	13,000
GPHA1554T6L	Horizontal	19	1554	1475	240	1.8	134	600	84	13,000
GPHVA1554T6L	Horizontal/Vertical	19	1554	1475	240	1.8	134	600	84	13,000
GPHHA357T6L	Horizontal	19	357	278	65	2.1	31	140	14	13,000
GPHHA843T6L	Horizontal	19	843	764	172	2.1	82	490	54	13,000
GPHHA1000T6L	Horizontal	19	1000	921	207	2.1	99	570	65	13,000
GPHHA1554T6L	Horizontal	19	1554	1475	320	2.1	154	750	112	13,000
GXA1500T10L	Horizontal	32	1500	1435	270	3.8	75	650	93	13,000
GPHHA1310T10L	Horizontal/Vertical	32	1310	1190	404	5.0	82	1,050	130	13,000
GPHHA1554T10L	Horizontal/Vertical	32	1554	1434	471	5.0	95	1,160	157	13,000
GPHHA1554T10L-HO	Horizontal/Vertical	32	1554	1434	500	5.5	90	1,300	165	13,000

UVC intensity measured at 1 meter distance. Custom lamp bases, and ozone-free or ozone-generating (185nm) quartz, are available to order — contact us with your reactor specification.