Fluorescent Leak Detection Flashlight LUYOR-365L

LUYOR-365L: Reveal invisible leaks with high-power, wide-beam UV-A light

LUYOR-365L is a compact, wide-coverage fluorescent leak detection flashlight. Equipped with 4 high-power UV-A LEDs, the LUYOR-365L delivers a steady-state UV-A intensity of 6,500 µW/cm² across its full 150 mm coverage zone, far exceeding industry requirements. This powerful, wide-angle UV beam generates bright fluorescence to reveal even the smallest leaks.

Powered by a high-capacity lithium battery, LUYOR-365L features instant-on operation and offers 3 hours of continuous runtime on a full charge. Its lightweight, handheld cordless design enables flexible leak detection in hard-to-reach areas, eliminating the restrictions of mains power. Constructed with a rugged aluminium housing, it withstands the demanding conditions of field service and industrial sites.

Designed for fluorescent leak detection, LUYOR-365L serves aerospace, oil & gas, manufacturing, automotive, hydraulic and HVAC systems. It helps inspectors rapidly locate leaks of oil, coolant, refrigerant and hydraulic fluid, cutting inspection cycles, reducing downtime and supporting reliable maintenance and non-destructive testing workflows.

Key Features

• High UV Intensity Output: 4 high-power UV-A LEDs output an intensity of 6,500 µW/cm², producing bright fluorescence to reveal even tiny leaks.

• Wide Coverage Area: 150 mm effective beam diameter for faster fluorescent leak detection.

• Narrow Band Output: Peak wavelength at 365 nm, spectral range 360–370 nm, free of UVB and UVC.
  

• Portable, Handheld Design: One-hand operation, perfect for on-site leak detection.

• Instant-on Operation: Unlike traditional high-pressure mercury lamps that require up to 5 minutes of warm-up, LUYOR-365L starts instantly with no waiting and no inspection delays.

• Soft-Touch Switch: Easy to operate even while wearing protective gloves.

• Battery Level Indicator: Built-in indicator shows remaining battery power at a glance.

• Cold Light Source: Maintains low housing temperature even during extended operation.

• UV Protective Glasses Included: UV safety glasses supplied as standard for eye protection.

• Rugged Aluminum Alloy Housing: Built with high-strength aluminum alloy for long-lasting durability.

Technical Data

What's Included

1. LUYOR-365L Fluorescent Leak Detection Flashlight

2. Rechargeable battery

3. Battery charger

4. LUV-10A UV protective glasses

5. Aluminum carrying case

Leak Detection Principle

The leak detection principle is that LUYOR Fluorescent Leak Detection Dye will emit bright yellow green light under the illumination of ultraviolet light. LUYOR-365L Fluorescent Leak Detection Flashlight, also known as black light flashlight, can emit ultraviolet light which excites the fluorescence of the fluorescent tracer and enables users to discover leakage points in various systems. Fluorescent leak detection is a preventive and planned maintenance method that can measure leaks in air conditioning refrigeration, oil and water systems.

LUYOR fluorescent leak detection flashlights are safe, economical, and effective. With LUYOR-365L, small leaks can be easily detected in any system. It can be used in any fluid system without damaging the performance of the fluid and system components in the original system. We also offers LUYOR-6100 Fluorescent Leak Detection Dye for industrial fluids or hydraulic systems, which are particularly effective in detecting small pinhole size leaks in gaskets, seals, O-rings, and pipelines. LUYOR-6100 Fluorescent Leak Detection Dye is excellent for detecting gasoline and diesel leaks in storage tanks, fuel lines, and fuel injection pipelines. LUYOR-6200 can be used to detect static or circulating water system leaks in large systems such as nuclear power plants, power plant condensers, and water storage tanks. In addition, LUYOR provides specialized fluorescent dye for leak detection in offset printing machines, milling machines, locomotive engine oil circuit coolers, and oil cooler leaks.

Operation Guide

1. Wear LUV-10A UV protective glasses to protect your eyes from the UV light.

2. Add a certain proportion of fluorescent leak detection dye to the system.

3. After the system operates for 3 to 20 minutes, use LUYOR-365L Fluorescent Leak Detection Flashlight to illuminate the outside of the system. The leak points will emit strong fluorescence and become easily visible. Then you can quickly detect any small leaks in the system.

Applications

Aviation, vehicles, ships, diesel locomotives, metallurgy, coal mining, refrigeration and air conditioning, HVAC engineering, petrochemical, engineering, machinery and other industries.

Fluorescent leak detection for closed-cycle or non-cycle systems such as engine lubrication, power steering, transmission, hydraulic transmission, cooling of liquefied gas transmission pipelines or storage equipment.

All automotive air conditioners, household air conditioners, central air conditioners, and other commercial air conditioners.

Whether it is a refrigeration system (e.g. R12, R22, R134a, R407c, R600a, BrLi, CFC, HCFC, HC, etc.) or a system containing oil phase (PAG, POE, AB, MA, DRA, etc.), water phase, lubrication, power, and media of various alkanes and olefins, LUYOR-365L is a high-performance tool for fluorescence leak detection.

Typical Customers

• Caterpillar

• Cummins

• SANY Group

• Ford

• Yutong

• and more ...

Frequently Asked Questions about LUYOR-365L

Why do we use 365nm light for leak detection?

Fluorescent leak detection lamps have ultraviolet light sources, purple light sources, blue light sources, and white light sources. Why dow we choose ultraviolet light sources? The reason is that UV light is not visible while purple light, blue light, and white light are all visible. Visible light interferes with the fluorescence emitted by the fluorescent dye at the leakage point. Therefore, it is necessary to wear yellow fluorescence viewing glasses. Even with glasses, we may miss some leak points due to light interference. Therefore, UV light source is an optimal choice and it is excellent for discovering small leakage points. LUYOR-365L uses 4 high-power 365nm LEDs as light sources, which can emit strong ultraviolet light and easily locate leakage points.

Safety concerns?

Some people are worried about the harm of ultraviolet radiation to operators. In fact, the frequently reported harm of ultraviolet radiation to people in the news is the short-wave ultraviolet disinfection lamp, which has strong damage to human skin. LUYOR-365L uses a narrow band ultraviolet light source and does not have short-wave or medium-wave ultraviolet radiation. You only need to wear the provided LUV-10 ultraviolet protective glasses when using LUYOR-365L.

Why do we choose LUYOR-365L for leak detection?

LUYOR-365L VS Traditional high-pressure mercury lamps

Traditional high-pressure mercury lamps use 100W high-pressure mercury lamp bulbs, with a start-up time of 5 minutes, a lifespan of 800 hours, and a surface temperature of around 200 degrees Celsius. The price ranges from 700 to 1,000 USD, and the annual maintenance cost ranges from 300 to 400 USD. LUYOR-365L overcomes various drawbacks mentioned above and has higher intensity compared with traditional mercury lamps.

LUYOR-365L VS Traditional HID lamps

Traditional HID lamps use Philips DUV-35W 35W HID ultraviolet bulbs, with a start-up time of 15 seconds, a bulb lifespan of 3,000 hours, and a surface temperature of 150-200 degrees Celsius. The price ranges from 1,600 to 2,800 USD, and the annual maintenance cost ranges from 300 to 400 USD. LUYOR-365L overcomes the drawbacks mentioned above and offers more uniform irradition.

LUYOR-365L VS Other fluorescent leak detection flashlight

Most fluorescent leak detection flashlights use a single ultraviolet LED as the light source, with a spot area of only about 20mm. LUYOR -365L offers wider coverage area while extends the warranty period by 2 years.