QTE-140 Installation Guide - Underwater Lights QT-LED Range

Sep 4, 2026

QT-LED QTE-140 underwater yacht light installation guide describing the submersible marine light design with universal 20° ball adjustment. Covers lens fitting and LED projector fitting steps, required torques (notably 7Nm), component identification for inserts, gaskets, lens and LED heatsink parts, and installation drawing references. Includes product safety and warranty notice, installation fitment depth guidance below the waterline, and detailed welding, finishing, and protection procedures for stainless steel 316L and aluminium 5083 inserts with pressure testing and barrier concepts.

LanguageEnglish

CategoryTechnology

FormatPDF

Pages10

Reading Time25 min

AccessFree to download

QTE-140 Installation

Description

Lens Fitting Instructions

LED Projector Fitting Instructions

Installation Information (Primary/Secondary Containment)

Welding, Finishing & Protection Procedures

316L SS Welding Procedure

5083 Welding Procedure

TM QT-LED INSTALLATION GUIDE UNDERWATERLIGHTS.COM THE QT-LED RANGE IS DESIGNED AND MANUFACTURED BY UNDERWATERLIGHTS LIMITED QT-LED INSTALLATION GUIDE NEW 1991 The launch of the worlds ﬁrst underwater light for yachts-The Bulleyt. 2005 The Bulleyt is superseded by the ULTi MATE range 2009 We launched our ﬁrst ULTiMATE light with LED 2016 QT LED launched using latest technology with ﬂat LED chip producing 100% more lumens 2022 QTS 75 launched using our unique design allowing universal adjustment for ease of installation. 2024 QTE 140 is ﬂush mounted to the hull and has a larger aperture for wider beam angle and universal adjustment. WWW.UNDERWATERLIGHTS.COM THE QT-LED RANGE IS DESIGNED AND MANUFACTURED BY UNDERWATERLIGHTS LIMITED IMPORTANT IMPORTANT: Please read the instructions completely before proceeding with the installation, for full manual please visit [www.underwaterlights.com. Failure](www.underwaterlights.com. Failure) to follow the instructions may invalidate your warranty. This manual contains important information about the installation, operation and safe use of this product. This information should be given to the owner and/ or operator of this equipment. QT-LED INSTALLATION GUIDE QTE-140 INSTALLATION DESCRIPTION – The QTE-140 range is a submersible marine light with a universal 20 degree ball adjustment. There are two types of insert 316 stainless steel and 5083 aluminium which have been machined so they can be welded flush to the hull at the appropriate locations. All weldins are machined from 3.2 Lloyds certificated material and individually stamped. Final adjustment of the beam angle to the horizontal is carried out from inside the hull. See instructional information below. LENS FITTING INSTRUCTIONS Remove the blanking plate and check the insert (1) lens landing surfaces are clean and apply a suitable silicone grease to the gaskets (2) . Fit the lens (3), gaskets (2) and lens retaining ring (4) . Hand tighten the cap head bolts (6) making sure the lens retaining ring (4) is square. Torque the bolts to 7Nm (4 . 5ft/lbs) in the sequence shown above, check the ring again and re-torque the screws again to the same setting. LED PROJECTOR FITTING INSTRUCTIONS All bolts and nuts are torqued to 7Nm (4 .5ft/lbs) The LED heatsink (8) with the orings (7) fitted is inserted into the insert (1) and secured with the two M5 bolts(10) . The LED ball can then be adjusted. The LED heat sink cover (9) is fitted into the heatsink (8) with the orings (7) fitted and secured using the eight M8 (11) bolts securing the parts to the insert (1) . | DESCRIPTION | QNTY | | --- | --- | | 1 – INSERT S. S | 1 | | 1 – INSERT ALU | 1 | | 2 – GASKET | 2 | | 3 – GLASS LENS | 1 | | 4 – LENS SECURING RING S. S | 1 | | 4 – LENS SECURING RING ALU | 1 | | 5 – M6 SPRING WASHERS S. S | 12 | | 5 – M6 SPRING WASHERS ALU | N/A | | 6 – M6 CAP HEAD BOLTSA4 | 12 | | 6 -M6 CAP HEAD BOLTS Ti | 12 | | 7 – ‘O’RING | 4 | | 8 – LED HEATSINK | 1 | | 9 – LED HEATSINK COVER | 1 | | 10 – M5 TITANIUM CAP HEAD BOLTS | 2 | | 11 – M8 TITANIUM CAP HEAD BOLTS | 8 | VALID FROM MAY 2025 QTE-140 INSTALLATION INFORMATION The design of the QT-75, QTS-75 and the QTE-140 was to ensure that the primary containment design pressure exceeded the design hull pressure of an ice class yacht using 19mm thick shell plating. Primary containment is shown shaded with the glass and glass retaining ring installed in the inserts which is welded to the hull shell plating forming the primary barrier. The pressure test was carried out on the water front (water side) face to 100 bar. Insert welded to the hull shell plating Primary barrier with glass and retaining ring Secondary containment is shown below shaded with he primary barrier glass and securing ring removed and this containment barrier is bolted to the insert using the bolts. A pressure test was carried out from the waterside of the insert and tested to

FAQs

What is the QTE-140 light and what adjustment does it provide?

The QTE-140 is a submersible marine light with a universal 20 degree ball adjustment to set the beam angle.

What is the required torque for bolts during installation?

Lens and LED projector components are torque-tightened to 7Nm (about 4.5 ft/lbs), following the specified sequence and re-check steps.

What installation depth is required for the insert?

When loaded with 50% fuel and 50% freshwater, the insert must be fitted a minimum of 300mm below the yacht’s waterline.

Sep 4, 2026

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