GE 92585 CMH70/TC/U/830 G8.5

The GE 92585 CMH70/TC/830/G8.5 ConstantColor® is a premium 70W pulse-start ceramic metal halide lamp engineered for compact retail display, gallery accent, and high-end commercial interior lighting applications requiring 3000K warm white color quality and stable ceramic MH performance in a G8.5 bi-pin base format. Delivering 6,200 initial lumens at 80+ CRI and over 88 lm/W through a compact T4.5 tubular envelope, this ANSI M139/C139-rated lamp provides a 15,000-hour rated service life without the green color shift common in standard quartz metal halide sources.

ADL Supply Expert Application & Replacement Guide

The GE CMH70/TC/830/G8.5 (Order Code 92585) is primarily specified by lighting designers and electrical contractors for compact commercial track heads, small-aperture recessed downlights, jewelry and fashion retail showcase fixtures, and gallery accent systems where the G8.5 base CMH platform enables smaller, more discreet luminaire designs than the G12 base format. This lamp uses an ANSI M139/C139 pulse-start ballast — the same ANSI code as the 70W G12 CMH platform, but the G8.5 base (8.5mm pin spacing) is not physically interchangeable with the G12 base (12mm pin spacing). If your fixture uses G12 sockets, this lamp will not seat correctly — confirm your fixture socket is specifically G8.5 before ordering. ConstantColor® ceramic arc tube technology maintains stable 3000K color output throughout the 15,000-hour service life, preventing the green color shift that develops in standard quartz metal halide arc tubes as they age. This lamp requires a pulse-start ballast — probe-start and standard quartz MH ballasts are not compatible. The fixture must be fully enclosed and provide UV shielding — this lamp emits UV radiation and must not be used in open-face track heads or unenclosed fixtures.

Before You Order

Detailed Product Specifications

• Brand: GE Lighting
• Product Line Series: ConstantColor® CMH Ceramic Metal Halide — G8.5 T4.5
• Ordering Code: CMH70/TC/830/G8.5
• GE Order Code: 92585
• ANSI Code: M139 / C139 — Pulse-Start
• Core Technology: Ceramic Metal Halide (CMH) — ConstantColor® T4.5 Tubular
• Wattage: 70W
• Initial Lumens: 6,200 lm
• Luminous Efficacy: Over 88 lm/W
• Color Temperature (CCT): 3000K Warm White (830)
• Color Rendering Index (CRI): 80+
• Base Type Configuration: G8.5 Bi-Pin Ceramic (8.5mm pin spacing) — not G12
• Bulb Shape: T4.5 Tubular
• Maximum Overall Length (MOL): 3.37 inches (85mm)
• Rated Average Lifespan: 15,000 Hours
• Burn Position: Universal — Any Orientation
• Fixture Requirement: Enclosed with UV-Filtering Lens — open-face not permitted
• Mercury Content: Contains mercury — recycle per applicable regulations

Operation, Safety & Mounting Compliance

G8.5 vs G12 Base, Pulse-Start Requirement & UV Safety

The G8.5 and G12 bases both appear in 70W CMH lamp platforms and share the ANSI M139 ballast designation — but the 3.5mm difference in pin spacing makes these bases physically non-interchangeable. A G8.5 lamp will not seat in a G12 socket, and a G12 lamp will not seat in a G8.5 socket. The correct base must be verified against the fixture's socket specification before ordering. This lamp requires a pulse-start ballast with ANSI M139 or C139 rating — probe-start and standard quartz MH ballasts cannot deliver the ignition pulse required by the ceramic arc tube and must not be substituted. This lamp emits UV radiation and must be installed in an enclosed fixture with a UV-filtering lens; replace any cracked or damaged fixture lens immediately and do not operate with the fixture enclosure open. Allow a standard CMH hot restart cool-down interval (typically 5–10 minutes) following any power interruption before the arc re-ignites.

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.

Industry Cross-Reference Data

• Philips: MasterColor CDM70/TC/830 G8.5 (equivalent 70W G8.5 CMH 3000K)
• Sylvania: MC70T4/U/G8.5/830 (equivalent Metalarc 70W G8.5 compact CMH)
• Osram: HCI-TC 70W/830 WDL G8.5 (equivalent 70W G8.5 ceramic MH warm white)
• Legacy Cross-Reference: Direct replacement for ANSI M139 70W G8.5 ceramic metal halide T4.5 lamp positions in compact retail track, small-aperture downlight, jewelry display, gallery accent, and architectural enclosed 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.