Philips 148593 TL5C 40W/835

The Philips FC12T5/835 MasterColor (Order Code 14859-3) is a high-performance 40W T5 circular (circline) fluorescent lamp engineered for slim, low-profile luminaires requiring uniform omni-directional illumination. Delivering approximately 2,800 initial lumens of 3500K natural white output at 85 CRI through a 2GX13 4-pin base in a compact 12-inch outer diameter circular format, this 800-series phosphor circline lamp provides approximately 12,000 hours of rated service life on compatible electronic ballasts for decorative ceiling fixtures, modular recessed lighting, ceiling fan light kits, and commercial wall sconces.

ADL Supply Expert Application & Replacement Guide

The Philips FC12T5/835 MasterColor is primarily specified by electrical contractors and facility maintenance teams for replacement in decorative circular ceiling fixtures, ceiling fan light kits, modular round recessed luminaires, and commercial wall sconces where the 12-inch T5 circline format and 2GX13 4-pin base are the installed standard. The 2GX13 4-pin base is a push-in 4-pin base used specifically on T5 circline lamps — it is distinct from the 2G11 4-pin base used on T5 straight-tube lamps, the GX24q 4-pin CFL base, and the standard G13 bi-pin T8 base. Confirm your fixture socket is specifically 2GX13 before ordering. This lamp requires a compatible electronic ballast specifically designed for 40W T5 circline operation — standard T8 or T12 ballasts are not compatible, nor are ballasts designed for T5 straight-tube (2G11 base) lamps. Ensure the 4-pin base is fully clicked and seated in the socket before powering the fixture; partial engagement causes arcing at the pin contacts, flickering, and premature ballast failure. For partial relamping in a multi-lamp installation, confirm all existing lamps are 3500K before ordering to avoid a perceptible color inconsistency.

Before You Order

Detailed Product Specifications

• Brand: Philips Lighting
• Product Line Series: MasterColor T5 Circline Fluorescent — 800-Series Phosphor
• Model Number: FC12T5/835
• Philips Order Code: 14859-3
• Core Technology: T5 Circular Fluorescent — 800-Series Tri-Phosphor
• Ballast Requirement: Electronic ballast rated for 40W T5 circline — T8, T12, and T5 straight-tube ballasts not compatible
• Wattage: 40W
• Initial Lumens: Approximately 2,800 lm — confirm with Philips specification sheet
• Color Temperature (CCT): 3500K Natural White (835)
• Color Rendering Index (CRI): 85 Ra
• Base Type Configuration: 2GX13 4-Pin Push-In
• Outer Diameter: 12 inches (approximately 300mm)
• Tube Diameter: 5/8 inch (16mm) — T5
• Rated Average Lifespan: Approximately 12,000 Hours — confirm with Philips specification sheet
• Burn Position: Horizontal (circular lamp — base parallel to ceiling plane)
• Mercury Content: Contains mercury — recycle per applicable regulations

Operation, Safety & Mounting Compliance

2GX13 Base Specificity, Ballast Compatibility & Socket Seating

The 2GX13 4-pin base is exclusively for T5 circline lamps — it physically cannot seat in a 2G11 T5 straight-tube socket or a G13 T8 socket. The four pins engage four socket contacts simultaneously when the lamp is pushed fully into the socket; a partially engaged lamp will cause intermittent contact arcing that damages both the socket contacts and the ballast input stage. The ballast must be specifically rated for 40W T5 circline operation — the lamp's starting and operating electrical parameters are matched to the T5 circline ballast design, and substituting a T8 or straight-tube T5 ballast will result in non-ignition or premature lamp failure.

Mercury Content & Disposal

This lamp contains mercury and must be recycled through a certified lamp recycling program in compliance with applicable federal, state, and local regulations — do not discard in standard municipal solid waste. This product cannot be shipped to CA, CO, HI, ME, MN, OR, RI, or VT.

Industry Cross-Reference Data

• GE Lighting: FC12T5/835 (equivalent 40W T5 circline 3500K 2GX13)
• Sylvania: CF40DT5/835 (equivalent 40W T5 circline natural white 2GX13)
• Osram: FC 40W/835 T5 (equivalent 40W 3500K circline 2GX13 platform)
• Legacy Cross-Reference: Direct replacement for 40W T5 circline 3500K 2GX13 4-pin lamp positions in decorative ceiling fixtures, ceiling fan light kits, round recessed luminaires, and commercial wall sconce installations

Bulk Commercial Lighting Supply & Project Support

ADL Supply delivers commercial-volume logistical fulfillment, tiered commercial contractor discounting strategies, and full pallet project quoting options to electrical accounts across the United States.

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.