Competitive Intelligence

Proteus Instruments Direct Competitor

Proteus builds the most feature-rich TLF-based multiparameter sonde on the market. Their Proteus 35 and 40 models measure up to 13 parameters simultaneously, including TLF-derived BOD, COD, and coliform estimates. They are the closest direct competitor to Virridy's Lume in the real-time E. coli/TLF sensing space.

Products

Available Parameters

• Fluorescence: Tryptophan (TLF), CDOM, Chlorophyll-a, Blue-Green Algae, Crude Oil, Refined Oil, Rhodamine, Fluorescein, Optical Brighteners
• Derived: BOD, COD, DOC, TOC, Coliforms, E. coli
• Physicochemical: DO, pH, Temperature, ORP, Conductivity, Salinity, TDS, Turbidity, Pressure/Depth
• Ion-Selective: Ammonium, Nitrate, Chloride, Sodium, Calcium, Bromide, Ortho-phosphate, Total Phosphate

Distribution Partners

• Fondriest Environmental — US distributor (also offers rental)
• RS Hydro — UK distributor (parent company)
• NexSens — US, buoy platform integration
• Libelium — IoT platform integration
• GPM — Asia-Pacific

Proteus — Company Financials

Proteus — Customers & Sales

Most customers are anonymized in case studies due to commercial NDAs. These are confirmed named buyers.

Key Observations

• Most customers are anonymized. Proteus uses "a UK Water Company" or "a government agency" in most case studies — likely due to commercial NDAs.
• Only confirmed pricing: Scottish Water framework at ~£2M over 4 years (multiple units + telemetry + services). No per-unit prices found anywhere publicly.
• The unnamed "largest catchment network" customer (131 sondes, 250+ outstations) is their biggest deployment. Not Scottish Water or United Utilities (those are named separately). Likely one of the larger English water companies.
• H2NOW Chicago is notable: The H2NOW website now features Virridy's Lume sensor as a current tech pilot, suggesting possible evolution away from Proteus.
• Revenue of ~$561K annually with estimated $10K–30K per unit suggests total unit sales in the low hundreds globally across 6+ years.
• UK water utilities are the primary market. Most confirmed sales are to UK water companies driven by Environment Act Section 82 compliance requirements.

Pricing Reference — Comparable Sondes

Proteus — Notable Mentions & Deployments

Chelsea Technologies Adjacent

Chelsea Technologies makes the UviLux, a compact single-channel UV fluorometer available in a tryptophan configuration. Unlike Proteus, it measures only one parameter at a time and does not derive E. coli or BOD estimates. It's positioned for mass deployment in distributed sensor networks and deep-water applications.

UviLux Tryptophan — Key Specs

• Type: Single-channel UV fluorometer
• Measurement: TLF only (reports in QSU — Quinine Sulphate Units)
• Depth Rating: 1,000 m
• Key Features: Compact, low-cost, low-power, anti-biofouling options
• Best For: Mass deployment, distributed networks, deep water
• No E. coli model: Raw fluorescence only — no derived pathogen risk

Chelsea — Company Financials

Chelsea — Customers & Sales

Chelsea does not publish a customer roster. These are sourced from press releases, case studies, and academic papers.

Turner Designs Adjacent

Turner Designs makes the C-FLUOR, a submersible single-channel fluorescence probe available in a tryptophan configuration. It has the deepest depth rating in the category (2,000 m) and outputs a simple 0–5V analog signal for integration into third-party sonde platforms.

C-FLUOR Tryptophan — Key Specs

• Type: Single-channel submersible fluorometer
• Limit of Detection: 3 ppb
• Output: Analog 0–5V
• Construction: Titanium
• Depth Rating: 2,000 m
• Calibration: Factory calibrated
• No E. coli model: Raw fluorescence only

Turner — Company Financials

Turner — Customers & Sales

Turner Designs is broadly used in research and government but does not publish customer lists. These are confirmed from public records.

In-Situ Adjacent Competitor

In-Situ makes the Aqua TROLL series of multiparameter sondes — a major platform in environmental water quality monitoring. They offer fDOM, chlorophyll-a, and blue-green algae fluorescence sensors but no tryptophan (TLF) sensor and no E. coli detection capability. Their HydroVu cloud platform and VuSitu mobile app provide a complete data pipeline. Being acquired by Veralto (parent of OTT HydroMet) for $435M.

Aqua TROLL Product Line

Available Fluorescence Sensors

• fDOM — ~365 nm excitation (dissolved organic matter, NOT tryptophan)
• Chlorophyll-a — 430 nm excitation
• Phycocyanin (BGA-PC) — blue-green algae
• Phycoerythrin (BGA-PE) — blue-green algae
• Crude Oil — hydrocarbon fluorescence
• Rhodamine WT / Fluorescein WT — dye tracer studies
• No tryptophan (TLF) sensor — no E. coli capability

In-Situ — Company Financials

Acquisitions Made by In-Situ

In-Situ — Customers & Sales

In-Situ has a large install base but most customers are not individually named in public sources.

Solinst / Eureka Adjacent Competitor

The Manta Plus is a traditional multiparameter sonde with a tryptophan fluorometer option (0–5,000 ppb range, 3 ppb LOD). Up to 12 sensors per sonde. USGS validated (Open-File Report 2017/1118). Established platform but no E. coli derivation from TLF.

Solinst / Eureka — Company Financials

Solinst / Eureka — Customers & Sales

Sourced from USGS reports and published case studies. No tryptophan-specific deployments identified publicly.

S::CAN Indirect Competitor

The spectro::lyser uses UV-Vis absorbance spectroscopy (not fluorescence) for inline water quality monitoring. Competes in the real-time BOD/COD proxy space but uses a fundamentally different technology. Strong in drinking water applications. 10,000+ units installed globally.

S::CAN — Company Financials

S::CAN — Customers & Sales

S::CAN has a large global install base but most customers are anonymized. These are publicly identified.

Xylem / YSI Indirect Competitor

The EXO multiparameter sonde is the market leader in water quality sondes with a massive install base. Offers fDOM/CDOM fluorescence sensors but not specifically tryptophan-focused. No E. coli derivation. Indirect competitor due to market position and mindshare. Depth rating 250 m.

Xylem / YSI — Company Financials

Xylem / YSI — Customers & Sales

YSI EXO is the dominant platform in water quality sondes. Massive install base across government, academic, and consulting sectors.

Real Tech / ABB Indirect Competitor

Real-time UV-based water quality monitoring. Acquired by ABB in early 2024, giving them significant resources. UV absorbance-based approach rather than fluorescence. Competes in the real-time organics monitoring space. Thousands of units deployed across 50+ countries.

Real Tech / ABB — Company Financials

Real Tech / ABB — Customers & Sales

Real Tech has broad municipal/industrial deployment. Most customers not individually named.

Academic / Low-Cost TLF Sensors

Several academic groups are developing low-cost TLF sensors using UV-LEDs and photodiodes, particularly for developing-world applications. See MDPI Sustainability 2020 paper. These are pre-commercial but represent future low-cost competition — and potential validation for the TLF approach.

IDEXX Laboratories Indirect Competitor

IDEXX is primarily a veterinary diagnostics company (~92% of revenue), but its Water segment ($201M in 2025) is the global standard for lab-based microbial water testing. Their Colilert product line uses Defined Substrate Technology (DST) — an enzyme-substrate method requiring 18–24 hour incubation — to detect E. coli and total coliforms. While IDEXX dominates lab-based compliance testing, their approach is fundamentally different from real-time TLF sensors like Virridy Lume: Colilert is a consumable test kit used in labs, not a continuous in-situ sensor.

Water Segment Products

How Colilert / DST Works

Defined Substrate Technology uses two nutrient-indicator substrates: ONPG (metabolized by coliform enzyme beta-galactosidase, produces yellow color) and MUG (metabolized by E. coli enzyme beta-glucuronidase, produces fluorescence). The substrates are the primary carbon source — non-target organisms that lack these enzymes cannot grow. A water sample is mixed with the reagent, sealed in a Quanti-Tray, and incubated at 35°C for 18–24 hours.

This is fundamentally different from TLF sensing: Colilert detects cultured bacterial enzymes after incubation in a lab; Virridy Lume detects tryptophan fluorescence in situ as a real-time proxy for fecal contamination without any sample collection, reagents, or wait time.

Estimated Pricing

UK retail prices from Test All Water. US institutional pricing likely lower in volume. Total cost per sample including Quanti-Tray, incubation, and labor is typically $15–30 at municipal labs.

Regulatory Approvals

• U.S. EPA: Approved method for total coliforms and E. coli in drinking water (Safe Drinking Water Act compliance), ambient water, surface water, groundwater, and wastewater
• ISO 9308-2:2012: Colilert-18/Quanti-Tray is the worldwide ISO standard for detecting total coliforms and E. coli — replaced previous ISO 9308-2:1990
• Standard Methods: Included in Standard Methods for the Examination of Water and Wastewater
• AOAC International: Approved
• IBWA / EBWA: Accepted by International/European Bottled Water Associations
• Methods Update Rule (2017): EPA expanded Colilert-18 approval to additional water types including wastewater E. coli testing

Notable Acquisitions & Market Position

• Tecta-PDS acquisition (Nov 2022): Acquired Canadian company specializing in automated water microbiology testing, expanding from lab-only to field/automated E. coli detection
• Global reach: IDEXX claims to help safeguard water quality for 2.5+ billion people daily
• Market position: Dominant player in microbiological water testing alongside Thermo Fisher, 3M, and Danaher
• Colilert is the de facto standard for municipal drinking water compliance testing in the US and increasingly worldwide

IDEXX — Company Financials

IDEXX vs. Virridy Lume — Technology Comparison

Competitive Positioning

IDEXX is an indirect competitor to Virridy Lume. They occupy the same problem space (E. coli detection in water) but use a fundamentally different approach (lab-based culture vs. real-time sensing). Key dynamics:

• Complementary, not replacement (near-term): Virridy Lume does not replace regulatory compliance testing that requires EPA-approved culture methods. Instead, it provides continuous screening between compliance samples — catching contamination events that Colilert's periodic grab samples would miss.
• Disruption potential (long-term): If TLF-based methods gain regulatory acceptance, real-time sensors could reduce the frequency of required lab-based tests, directly threatening IDEXX's consumable revenue model.
• Different buyers: Colilert is purchased by lab managers and compliance officers; Lume is purchased by operations teams, utilities, and environmental monitoring programs needing real-time awareness.
• Validation opportunity: Colilert data is the gold-standard reference against which TLF correlations are validated — IDEXX's own product helps prove the TLF approach works.
• Tecta-PDS watch: IDEXX's 2022 acquisition of Tecta-PDS (automated field-based E. coli detection) signals interest in moving beyond traditional lab testing — potentially toward semi-continuous monitoring that competes more directly with sensor-based approaches.