Philips 31621-6 ENH 250W 120V

The Philips Focusline 31621-6 ENH Lamp is a premium, high-precision photo-optic tungsten-halogen reflector bulb engineered for demanding film and slide projection gear, overhead projectors, medical diagnostic instrumentation, and specialty staging hardware. Operating at 250 watts over a line-voltage 120V circuit, this high-performance MR16 bulb projects an intensive, focused beam of 3250K bright white light through a precision-faceted cool-beam reflector casing. Outfitted with an industry-standard GY5.3 bi-pin base and a heavy-duty C-6 core filament, it provides a stable, distortion-free 100 CRI color index profile over a calibrated 175-hour specialized service lifespan.

ADL Supply Expert Application & Replacement Guide

The Philips Focusline ENH (31621-6) lamp is an industry-standard specialized optical instrument specified heavily by audio-visual production specialists, biomedical technicians, and laboratory maintenance groups. This bulb serves as the definitive genuine replacement matching OEM specifications across 8mm/16mm slide projectors, film projection decks, microfilm reading stations, clinical overhead dental lamps, color-sorting optical platforms, and targeted theatrical entertainment spotlights.

Critical Line-Voltage and Circuit Guidelines for Maintenance Crews: Unlike standard low-voltage MR16 reflector bulbs that operate on 12V or 24V step-down transformers, this model is specifically engineered to run natively on a **120-volt line-voltage circuit footprint**. Attempting to substitute a low-voltage lamp into an ENH-wired track housing without verifying line properties will result in instant component destruction and introduce an extreme arc fault hazard. This lamp is calibrated strictly for **S90 (Vertical Base-Down to Horizontal) burn angles**. Mounting or running this capsule outside approved operating position zones traps heavy convective heat patterns within the terminal pinch seals, accelerating filament sag and early structural runtime breakdown.

Detailed Product Specifications

• Brand: Philips Lighting (Signify Focusline Series)
• Product Series Line: High-Performance Photo-Optic Faceted Reflector Series
• Philips Order Code Catalog SKU: 31621-6 (Alternative Code: 316216)
• Manufacturer Nomenclature Model: ENH 250W 120V
• Official Trade Industry ANSI Code: ENH Certified Standard
• UPC Barcode Number: 8711500410627
• Core Technology Class: High-Intensity Quartz Halogen (Single-Ended Reflector)
• Operational Wattage: 250 Watts
• Nominal System Input Voltage: 120 Volts Line Voltage
• Initial Luminous Flux: 350 Lumens (Focused Projection Path Output)
• Color Temperature Configuration: 3250K Bright White
• Color Rendering Index (CRI): 100 Ra (Absolute Light Quality Representation)
• Optical Reflector Design: 50.7mm Multifaceted Dichroic Reflector Envelope
• Base Configuration: GY5.3 (2-Pin Flat Pin Socket Matrix)
• Tungsten Filament Core Structure: C-6 Precision Coil Layout
• Enclosure Envelope Face: Open Design (Unshielded Open-Face Casing / No Front Glass)
• Maximum Overall Length (MOL): 1.75" Inches (44.5mm actual)
• Bulb Reflector Diameter (DIA): 2.00" Inches Nominal MR16 (50.7mm actual)
• Rated Average Lifespan: 175 Hours (Constant Voltage Scale)
• Chassis Burn Position Limit: S90 (Base Down to Horizontal Permitted — Base Up Prohibited)
• Environmental Rating: Mercury-Free (Standard electronic waste handling rules apply)

Operation, Safety & Mounting Compliance

High-Temperature Thermal Boundaries and Cooling Care

Because high-power 250W quartz halogen projector elements generate intense localized thermal envelopes and high internal structural pressures within seconds of ignition, always isolate incoming line feeds and allow a full 20-minute resting intermission for components to cool down before performing replacement sweeps. Ensure all fixture casing vents, dynamic exhaust tracking grids, and integrated cooling fans remain free of dust blockages to allow thermal loads to escape smoothly away from the rear quartz pin seals.

Quartz Glass Preservation and Contamination Prevention

Never handle the internal clear quartz burner or the multifaceted reflector face with bare skin during installation. Human fingers deposit microscopic alkaline body oils that bond chemically to the crystal envelope during extreme heating cycles. This organic contamination blocks cooling paths, producing localized thermal points that fast-track envelope devitrification, early structural clouding, and premature rupture under operating pressure. Installers must execute re-lamping sweeps using clean cotton tech gloves, a lint-free microfiber cloth, or its original wrapper sleeve. Clean meticulously with isopropyl alcohol if accidental contact takes place.

Specialty Equipment Cross-Reference Data

• GE / Tungsram Alternative: 38686 ENH 250W 120V
• Osram Sylvania Reference: 54986 ENH 250W 120V GY5.3
• Ushio Reference: ENH 250W 120V Projector Series

Bulk Commercial Lighting Supply & Project Support

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For professional contractor tiered discounts, full pallet freight distributions, or dedicated technical submittal specification sheets, reach our support center directly at 1-800-235-3489. We are your commercial supply partners as a dedicated wholesale Lighting Distributor In Doral, Florida.