Osram CFL Square 16 W/835 4-Pin

The Osram CFL SQUARE® 816838 (16W/835 GR10q) Lamp is a professional-grade, low-profile compact fluorescent bulb engineered for shallow ceiling bulkheads, commercial wall sconces, stairwell enclosures, and maintained emergency lighting systems. Delivering 1,050 initial lumens of crisp 3500K neutral white light, this unique "2D" flat square loop lamp provides uniform omnidirectional illumination that eliminates dark end-shadows. Outfitted with an industry-standard GR10q 4-pin flat connector base, it provides a 10,000-hour rated average service life when driven by high-frequency electronic control gear (ECG) or matching conventional ballasts.

ADL Supply Expert Application & Replacement Guide

The Osram CFL SQUARE 2D lamp is an established commercial facility maintenance standard specified heavily for low-profile exterior bulkhead fixtures, public indoor stairwells, hospital hallways, commercial corridors, and residential utility spaces. Designed with a flat, double-perimeter square tube tracking footprint, it spreads full-spectrum illumination uniformly across a wide spatial arc, effectively removing the dark end-shadow bands standard when trying to mount standard linear or dual-tube plug-in lamps inside shallow round or square pans.

Critical Electronic Ballast Requirements and 4-Pin Base Configuration: A major driver of warehouse shipping returns is miscalculating pin counts. This 16-watt model utilizes a specialized GR10q 4-pin flat plug-in base layout. It is entirely incompatible with legacy 2-pin GR8 sockets which are engineered for old magnetic chokes. The 4-pin design does not incorporate an internal starter or capacitor; it interfaces directly with a high-frequency electronic ballast network providing a nominal 103V AC operating arc loop.

Installers performing large-scale facility sweeps must handle alignment with care: ensure all four contact points line up cleanly with the receiver socket terminals before pressing the center retaining clip into the pan fixture housing. Forcing the plastic lamp base at an uneven entry angle will warp or snap the pins, breaking the gas-discharge circuit path.

Detailed Product Specifications

• Brand: Osram (Premium Compact Fluorescent Group)
• Product Series Line: CFL SQUARE® 2D Double-Tube Flat Series
• Osram Factory Catalog Product Code SKU: 816838
• International EAN / Barcode Identification Number: 4050300816838
• Manufacturer Nomenclature Model: CFL SQUARE 16W/835 GR10q
• Core Technology Class: Fluorescent Gas-Discharge — T4 Double 2D Flat Shape
• Primary Industry Ballast Requirement: 16W 4-Pin High-Frequency Electronic Ballast (ECG Compatibility)
• Operational Wattage: 16 Watts
• Nominal Arc Voltage Profile: Ballast Managed (Nominal 103V AC Lamp Operating Voltage)
• Initial Luminous Brightness: 1,050 Lumens
• Luminous Efficacy Ratio: 66 Lumens per Watt (LPW)
• Color Temperature Configuration: 3500K Neutral White (Lumilux White 835 Spectrum)
• Color Rendering Index (CRI): 80..89 Ra
• Base Type Configuration: GR10q (4-Pin Flat Square Push-In Matrix)
• Dimmable Status: Yes — fully dimmable when paired with a compatible electronic dimming ballast
• Maximum Overall Length (MOL): 8.07" Inches Diagonal Span (205.0mm actual)
• Bulb Structural Base Width: 5.43" Inches Face Edge (138.0mm actual width)
• Rated Average Service Lifespan: 10,000 Hours (Constant Ballast Control Regulation)
• Chassis Burn Position Limit: Universal — Operates reliably in any flat mounting position

Operation, Safety & Mounting Compliance

High-Frequency Electronic Regulation and Lumilux Phosphor Control

This 4-pin plug-in 2D lamp interfaces with matching high-frequency electronic ballasts incorporating an integrated end-of-life (EOL) automated cutout circuit tracking loop. Driving this lamp via high-frequency currents ensures a flicker-free instant ignition sequence and prevents early cathode sputtering. This module incorporates advanced tri-phosphor Lumilux coating layers along the internal glass perimeter wall to stabilize color rendition indexes and guard against early light depreciation across extended daily service cycles.

Mercury Content Dosing and Safe Bulk Disposal Protocols

This compact fluorescent lamp relies on trace mercury elements sealed within its gas-discharge chamber to execute its fundamental ultraviolet arc generation pathway. While engineered to adhere strictly to federal Toxic Characteristic Leaching Procedure (TCLP) non-hazardous verification criteria under standard auditing matrices, it remains a heavy-metal electrical component. It must be processed through structured commercial bulk recycling paths during facility maintenance swap routines rather than discarded into standard solid municipal waste streams.

Commercial Equipment Industry Cross-References

• GE Biax Line Match: 2D F162D/835/4P / Order Code 12211 (Standard 4-Pin 16W 2D)
• Sylvania Alternative: 21124 / 16W 2D 4-Pin 3500K
• Philips Alternative: Philips 16W 2D 4-Pin Neutral White Grid

Bulk Commercial Lighting Supply & Project Support

ADL Supply handles volume distribution shipments, multi-pack logistics, and contractor project quotes for procurement teams, schools, and warehouse facilities nationwide.

For specialized contractor pricing tiers, job-site pallet deliveries, or comprehensive submittal documentation, contact our support team directly at 1-800-235-3489. We are your commercial supply partners as an authorized wholesale Lighting Distributor In Doral, Florida.