Single-Ended Straight UVC Germicidal Lamp | 4-Pin Base, 4–79W, 10,000h

Product Overview

The single-ended straight UVC lamp is the workhorse of the water treatment industry — the format found inside residential under-sink purifiers, commercial UV sterilizers, pond and aquarium clarifiers, and OEM disinfection chambers worldwide. Both electrical connections terminate in a single 4-pin ceramic base at one end of the quartz tube, which means the equipment around it needs only one sealed penetration: simpler reactor design, faster lamp swaps, and fewer leak paths than double-ended constructions. The Legia Smart GPH-T5L(VH) series covers the full commercial range — twelve models from a compact 4W, 135mm lamp up to a 79W, 1630mm lamp delivering 250 μW/cm² at one meter.

What separates a long-lived lamp from a warranty claim is not visible from the outside: it is quartz purity, cathode design, and process control. Legia Smart single-ended lamps are built from high-purity fused quartz with reduced impurity content for maximum 254nm transmission, coated internally to resist solarization, and fitted with proprietary long-life cathodes. The result is a 10,000-hour rated life with high initial UVC output and a shallow decay curve — so a purifier validated at commissioning still meets its dose target a year later.

Every model is available in ozone-free quartz for pure germicidal service or 185nm-transmitting quartz where ozone-assisted oxidation is required, and bases can be configured to match the equipment platform. For distributors and service organizations, the series is dimensionally and electrically interchangeable with the standard single-ended lamps used across the water treatment industry — a direct, drop-in replacement line.

Why Single-Ended Construction Wins in Water Treatment

In a submerged or sleeve-mounted UV reactor, every lamp penetration through the vessel wall is a potential leak path and a service complication. Single-ended 4-pin lamps concentrate both electrical connections into one base at one end, so the reactor carries compression seals on one side only and the lamp slides out for replacement without draining the far end or disconnecting a second socket. In multi-lamp arrays — the norm in commercial systems from 10 GPM upward — that design difference converts directly into shorter maintenance windows and lower labor cost per lamp change.

The 4-pin base format also simplifies the electrical architecture: one lamp, one ballast channel, one connector. For OEMs designing purifiers, the single-ended format allows the ballast compartment, lamp well, and quartz sleeve to be serviced from a single access panel — the reason this format dominates the point-of-use and point-of-entry purifier market.

Core Advantages

• Full Range from 4W to 79W — Why It Matters: One supplier, one quality system, twelve lengths covering everything from a countertop purifier to a commercial 150+ GPM sterilizer rack. Distributors can consolidate their entire single-ended replacement-lamp inventory on one line.
• 10,000-Hour Rated Life — Why It Matters: Annual lamp replacement is the industry-standard service interval; a lamp rated for 10,000 hours arrives at that interval with margin to spare, instead of limping across the line at degraded output.
• Up to 250 μW/cm² at 1m — Why It Matters: Higher intensity per lamp raises single-pass log reduction in flow-through purifiers — the metric that determines whether a system meets its microbial spec at rated flow.
• High-Purity Coated Quartz — Why It Matters: Impurities and solarization absorb 254nm photons before they ever reach the water. High-purity, coated quartz keeps transmission high and the decay curve shallow across the full rated life.
• Ozone-Free or 185nm Ozone Versions — Why It Matters: The same lamp platform serves pure germicidal duty or combined UV+ozone oxidation for TOC reduction and taste-and-odor control — specified at order time, interchangeable in the field.
• Drop-In Industry Interchangeability — Why It Matters: GPH-T5L dimensions, 4-pin bases, and electrical characteristics match the de facto industry standard, so Legia Smart lamps replace incumbent brands without revalidation of the mechanical fit.

Typical Applications

Residential & Commercial Water Purifiers: Under-sink, countertop, and whole-house UV purifiers from 0.5 to 25 GPM — the core market for the 4W–41W models.

Commercial UV Sterilizer Racks: Multi-lamp flow-through sterilizers for food & beverage process water, laboratories, and light industry, built on the 55W–79W long-format models.

Ponds, Aquariums & Aquaculture: Clarifiers and sterilizers for koi ponds, public aquariums, and hatchery recirculation systems, where the single-ended format simplifies weatherproof sealing.

OEM Disinfection Equipment: Air purifiers, surface sanitizers, and Legia Smart’s own UV disinfection cabinets use single-ended lamps as their germicidal light source.

Technical Specifications

Model	Tube Dia (mm)	Length (mm)	Arc Length (mm)	Power (W)	Current (mA)	Voltage 50/60Hz (V)	UV Intensity @1m (μW/cm²)	UVC Output (W)	Rated Life (h)
GPH135T5L(VH)	12/15	135	67	4	170	28	16	1.5	10,000
GPH212T5L(VH)	15/19	212	144	10	425	30	22	2.0	10,000
GPH287T5L(VH)	15/19	287	219	14	425	41	40	4.0	10,000
GPH303T5L(VH)	15/19	303	235	15	425	43	42	4.1	10,000
GPH330T5L(VH)	15/19	330	262	17	425	44	45	4.5	10,000
GPH357T5L(VH)	15/19	357	289	18	425	51	54	5.7	10,000
GPH436T5L(VH)	15/19	436	368	21	425	62	72	7.3	10,000
GPH793T5L(VH)	15/19	793	724	38	425	112	120	13.0	10,000
GPH843T5L(VH)	15/19	843	775	41	425	120	150	15.0	10,000
GPH1149T5L(VH)	15/19	1149	1080	55	425	165	180	22.0	10,000
GPH1554T5L(VH)	15/19	1554	1486	75	425	220	240	33.0	10,000
GPH1630T5L(VH)	15/19	1630	1562	79	425	231	250	34.5	10,000

UV intensity measured at 1 meter distance. Custom lamp bases, and ozone-free or ozone-generating (185nm) quartz, are available to order — send us your equipment specification for a matched replacement.