Sylvania 20877 CF18DT/E/IN/835/ECO

The Sylvania CF18DTEIN/835/ECO Dulux T/E IN is an 18W triple-tube amalgam compact fluorescent lamp engineered for commercial and institutional downlights, task lighting, wall sconces, and specialty display fixtures requiring natural white color quality. Delivering 1,164 initial lumens of 3500K natural white output at 82 CRI through a GX24q-2 4-pin base, this Ecologic® TCLP-compliant amalgam CFL provides a 12,000-hour rated service life with stable lumen output across a wide ambient temperature range — optimized at approximately 35°C / 95°F in the base-up position.

ADL Supply Expert Application & Replacement Guide

The Sylvania CF18DTEIN/835/ECO is primarily specified by electrical contractors and facility maintenance teams for 4-pin GX24q-2 downlight trims, task lighting, wall sconces, and commercial display applications where 3500K natural white is the specified color temperature. The GX24q-2 4-pin base is the programmed-start electronic ballast interface — shunted lampholders where both socket contacts are internally connected are required. This lamp is not compatible with 2-pin GX24d-2 magnetic-start ballasts; confirm your fixture socket is specifically GX24q-2 (4-pin, round alignment pin). The "IN" designation confirms amalgam technology — this lamp uses an amalgam dose for optimized lumen output at elevated ambient temperatures. Rated lumen output is achieved at approximately 35°C / 95°F ambient in the base-up position; in cooler conditions or horizontal mounting, output will be somewhat lower during warm-up before stabilizing. Per NEMA guidance for high-frequency compact fluorescent ballasts, a shutdown (end-of-life detection) circuit is recommended — in rare abnormal end-of-life cases, the lamp can overheat at the base. The compatible ballast list below identifies confirmed compatible platforms. Confirm 3500K natural white matches your existing installation before partial relamping.

Before You Order

Detailed Product Specifications

• Brand: Sylvania (Ledvance)
• Product Line Series: Dulux T/E IN Amalgam Ecologic® Triple-Tube Compact Fluorescent
• Manufacturer Part Number: CF18DTEIN/835/ECO
• Abbreviation: CF18DTEIN835ECO
• NEMA Generic Code: CFM18W/GX24Q/835
• Industry Standard: IEC 60901-3418
• Core Technology: Triple-Tube Amalgam Compact Fluorescent — Ecologic® TCLP Compliant
• Ballast Requirement: Programmed-start electronic ballast for GX24q-2 — magnetic and 2-pin GX24d ballasts not compatible
• Wattage: 18W
• Initial Lumens (after 100 hours stabilization): 1,164 lm
• Mean Lumens: 1,001 lm
• Optimum Output: At approximately 35°C / 95°F ambient, base-up position
• Color Temperature (CCT): 3500K Natural White (835)
• Color Rendering Index (CRI): 82
• Base Type Configuration: GX24q-2 4-Pin — shunted lampholders required
• Bulb Shape: T4 Triple Tube (3U shape)
• Maximum Overall Length (MOL): 4.4 inches (111mm)
• Rated Average Lifespan: 12,000 Hours (based on 3-hour burn cycles)
• Amalgam Technology: IN — optimized for elevated ambient temperature performance
• Environmental Rating: Ecologic® — TCLP Compliant, reduced mercury
• Case Quantity: 50 per case
• Mercury Content: Contains mercury — recycle per applicable regulations

Compatible Ballasts for CF18DTEIN/835/ECO

The following ballasts are confirmed compatible with this lamp — confirm 18W GX24q-2 rating on the ballast specification sheet before installation:

• GE 71434 GEC218-MVPS-3W
• Fulham RH2-UNV-218-K
• Hatch FR1800
• Halco EP2CF18PS/MV/DC/K
• Howard EP2/18CF/MV/K
• Keystone KTEB-218-UV-TP-PIC-DW
• Philips Advance ICF-2S18-H1-LD
• Robertson PSM218CQMV
• Sylvania 51823 QTP1/2X18CF/UNV DM
• Universal Triad C218UNVME-000K

Operation, Safety & Mounting Compliance

GX24q-2 vs GX24d-2, Amalgam Performance & NEMA End-of-Life Warning

The GX24q-2 4-pin base is physically distinct from the GX24d-2 2-pin base — the 4-pin lamp will not seat in a 2-pin socket. GX24q-series programmed-start ballasts preheat the cathodes before arc ignition and require shunted lampholders. The amalgam ("IN") formulation maintains stable mercury vapor pressure across a wider ambient temperature range, making this lamp well-suited for enclosed downlight trims where internal temperatures exceed standard ambient ranges. Per NEMA guidance, high-frequency electronic ballasts for compact fluorescent lamps should incorporate end-of-life shutdown circuitry to prevent the base overheating failure mode that can occur in rare abnormal end-of-life situations.

Ecologic® Mercury Content & Disposal

This lamp's Ecologic® construction is TCLP compliant, qualifying spent lamps for non-hazardous waste treatment in applicable jurisdictions. Lamp recycling through a certified program remains required in most states regardless of TCLP status. This product cannot be shipped to CA, CO, HI, ME, MN, OR, RI, or VT.

Industry Cross-Reference Data

• GE Lighting: F18TBX/835/A/ECO (equivalent 18W GX24q-2 4-pin 3500K triple-tube amalgam)
• Philips: PL-T 18W/835/4P/ALTO (equivalent 18W 4-pin GX24q-2 natural white)
• Osram: Dulux T/E 18W/835 Plus (equivalent 18W GX24q-2 4-pin 3500K)
• Satco: CFT18W/4P/835 (equivalent 18W GX24q-2 triple-tube 3500K)
• Ushio: CF18TE/835 (equivalent 18W GX24q-2 natural white CFL)
• Legacy Cross-Reference: Direct replacement for 18W GX24q-2 4-pin triple-tube 3500K compact fluorescent lamp positions in commercial downlight, task lighting, wall sconce, and specialty display fixture installations

Bulk Commercial Lighting Supply & Project Support

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For formal wholesale inquiries, volume pricing modifications, or manufacturer spec sheet documentation, reach our commercial branch directly at 1-800-235-3489. We are your commercial supply partners as an authorized wholesale Lighting Distributor In Doral, Florida.