GE 29701 CMH70/TC/U/942/G8.5 70W 4200K 2-Pin

GE 29701 CMH70/TC/942/G8.5 ConstantColor® – 70W Ceramic Metal Halide | 6,200 lm | 4200K | 90 CRI | G8.5 Bi-Pin | ANSI M139 | 15,000 Hours | Enclosed Fixture Only

The GE 29701 (CMH70/TC/942/G8.5) is a 70W pulse-start ceramic metal halide (CMH) lamp from the GE ConstantColor® Mini CMH series, delivering 6,200 initial lumens at 4200K (Cool White) with 90 CRI through a T4.5 tubular compact envelope on a G8.5 bi-pin ceramic base (8.5mm pin spacing — not G12). It requires a dedicated ANSI C139/M139 pulse-start ballast and must be installed in a UL 1573 or UL 1598 listed enclosed fixture with UV-filtering glass only. This lamp emits UV radiation; open-face track heads and unenclosed fixtures are strictly prohibited. The lamp contains mercury. Please verify base type, ANSI ballast code, and fixture compliance before ordering.

Technical Specifications

Product Overview

The GE 29701 is a 70W G8.5 ceramic metal halide lamp at 4200K and 90 CRI — a substantially different specification from the 3000K/80+ CRI G8.5 variant (GE 92585) in the same lamp family. The 4200K cool white output with 90 CRI is the choice for applications where color discrimination accuracy is the primary requirement: jewelry and gemstone showcasing, luxury fashion retail, art gallery accent lighting, and other environments where the ability to distinguish subtle differences in hue, saturation, and surface texture matters more than warm ambiance.

At 6,200 lumens and 88.6 lm/W from 70W, the lamp delivers strong efficacy from the compact G8.5 T4.5 format, enabling smaller, more discreet fixture designs than G12-base alternatives at the same output level. GE ConstantColor® ceramic arc tube technology maintains stable 4200K color output throughout the 15,000-hour rated life, preventing the progressive color shift that affects quartz metal halide arc tubes as they age.

This lamp shares the G8.5 base and ANSI M139/C139 ballast code with the 3000K version (GE 92585). Buyers specifying either the 3000K (92585) or the 4200K (29701) version should confirm the CCT in the ordering code before purchase: the "830" suffix denotes 3000K/80+ CRI, while "942" denotes 4200K/90 CRI — these are different products for different applications despite using the same ballast and socket.

Compatible Applications

• Jewelry showcase and gemstone display lighting requiring high color discrimination
• Luxury fashion retail and apparel accent lighting
• Art gallery and museum accent luminaires
• Commercial CMH track heads and small-aperture downlights (enclosed, G8.5)
• Architectural accent installations where crisp cool white and 90 CRI are specified
• Any enclosed G8.5 ANSI M139/C139 70W CMH lamp position requiring 4200K/90 CRI

Before Ordering – Verify

• CCT and CRI: This lamp is 4200K / 90 CRI (ordering code suffix "942"). If 3000K warm white is required instead, see GE 92585 (CMH70/TC/830/G8.5). Both lamps use the same G8.5 base and ANSI M139 ballast — the only difference is CCT and CRI. Confirm the correct suffix before ordering.
• Base type: G8.5 bi-pin (8.5mm pin spacing) — not G12 (12mm) and not GX10. These bases are physically incompatible; confirm the fixture socket is specifically G8.5 before ordering.
• ANSI ballast code: ANSI C139/M139 pulse-start only. Do not substitute M130-coded 35W ballasts, probe-start metal halide ballasts, or any non-CMH-rated control gear — these will cause non-ignition, color instability, or arc tube failure. Reported compatible ballast platforms (unverified): GE GEMH70 series; Philips Xitanium 70W CMH; Osram PT-FIT 70 (ANSI M139).
• Enclosed fixture with UV-filtering glass required: This lamp emits UV radiation during normal operation. It must be installed exclusively in a UL 1573 or UL 1598 listed enclosed fixture with a UV-filtering glass front. Open-face track heads, open downlight housings, and bare-lamp socket installations are not permitted. Exposure to unshielded UV from an operating CMH arc tube can cause photokeratitis and skin burns.
• Allow a 3–5 minute cool-down before attempting to re-strike a hot lamp after a power interruption; attempting a hot re-strike without the required cool-down will result in non-ignition until arc tube pressure normalizes.

Safety and Handling Guidelines

• This lamp contains mercury; do not dispose of in municipal solid waste — recycle through a certified lamp recycling program in compliance with applicable federal, state, and local regulations
• UV radiation hazard: This lamp emits UV radiation during operation. The fixture must be enclosed with a UV-filtering glass lens at all times. Prolonged skin or eye exposure to unfiltered UV can cause photokeratitis (flash burn to the eyes) and skin burns. Replace damaged or cracked fixture lenses before resuming operation; do not operate with the fixture enclosure open.
• Allow a full cool-down period after de-energizing before accessing the lamp; CMH lamps operate at extreme surface temperatures
• Do not handle the outer bulb with bare skin; oils from contact accelerate devitrification. Use clean cotton gloves or handle by the base; clean with isopropyl alcohol if contact occurs before operation
• Allow the 3–5 minute re-strike cool-down interval before attempting to restart after any power interruption
• Confirm the G8.5 ceramic socket is rated for CMH maximum base temperatures; standard thermoplastic sockets are not suitable
• Check applicable state shipping regulations for mercury-containing lamps before ordering in quantity

Compliance

• ANSI C139 / M139 Certified (Pulse-Start CMH)
• Enclosed UL 1573 or UL 1598 listed fixture with UV-filtering glass mandatory
• Not approved for residential use or open-face track systems
• Contains mercury — subject to federal and state lamp disposal and recycling regulations
• RoHS compliance: verify with GE/Current if required for project specification

Ordering Information

• Order Code: 29701
• Manufacturer Part Number: CMH70/TC/942/G8.5
• ANSI: C139 / M139
• Base: G8.5 Bi-Pin (8.5mm) — for 3000K/80+ CRI G8.5 equivalent, see GE 92585; for G12 70W 3000K equivalent, see GE 20016
• Reported cross-references (unverified — confirm before substitution): Philips CDM-TC 70W/942 G8.5; Osram HCI-TC 70/942 NDL PB; Ushio UM70/G8.5/TC/942
• Note: UPC and pack quantity were not available in the source listing — contact ADL Supply to confirm before placing quantity orders

For wholesale pricing, bulk availability, or help confirming the correct replacement lamp, contact ADL Supply at 1-800-235-3489.