Product Overview
GE 20858 ESX/CG 20W MR16 Spot | 12V 15° 3750 CBCP | ConstantColor
GE ConstantColor® Precise™ ESX/CG 20W MR16 Narrow Spot Lamp
Order Code 20858 — 15° Narrow Spot — UV-Filtered Cover Glass — 5,000 Hour Life
Key Specifications
Product Overview
The GE ConstantColor® Precise™ ESX/CG 20-Watt MR16 Narrow Spot Lamp (Order Code: 20858) delivers exceptional beam control and color consistency for professional lighting applications. Featuring a precise 15° narrow spot beam and UV-filtered cover glass, this lamp provides concentrated, high-intensity illumination while protecting sensitive materials from ultraviolet radiation.
With 2,900K warm white light, 100 CRI, and GE's proprietary ConstantColor® reflector coating, this lamp maintains consistent, crisp white light throughout its 5,000-hour rated life—eliminating the greenish tint common in aging standard MR16 lamps.
Technical Specifications
Electrical
- Wattage
- 20 Watts
- Voltage
- 12 Volts AC/DC (Low Voltage)
- Base Type
- GU5.3 / GX5.3 Bi-Pin
- Filament
- C-6 (Added)
- Amperage
- 1.67A
Light Output
- Beam Angle
- 15° Narrow Spot (NSP)
- Center Beam Candle Power (CBCP)
- 3,750 cd (Correction: Not 3,150)
- Color Temperature
- 2900K Warm White
- Color Rendering Index
- 100 CRI
- Nominal Initial Lumens
- ~375 lm (18.7 lm/W) (Correction: Not 4,800)
Physical
- Maximum Overall Length (MOL)
- 47.6 mm (1.875 inches)
- Bulb Diameter
- 50.8 mm (2.0 inches)
- Face Design
- UV-Filtered Clear Cover Glass
- Burn Position
- Universal (Open or Enclosed Fixtures)
Product Information
- GE Order Code
- 20858
- Description
- Q20MR16C/CG15 (ESX/CG)
- ANSI Code
- ESX
- UPC
- 043168992961
- Rated Life
- 5,000 Hours
- Case Quantity
- 20 units
Two Versions Available
This product comes in two configurations:
- 20815 (Open Face): Q20MR16/C/NSP15 — 3,750 CBCP, no cover glass
- 20858 (Covered Glass): Q20MR16C/CG15 — UV-filtered cover glass, slightly different CBCP
Both share identical electrical characteristics (20W, 12V, 2900K, 15° beam, 5,000 hr life, C-6 filament).
ConstantColor® Technology Benefits
GE's ConstantColor® reflector coating prevents the yellow/green tint common in standard MR16 lamps as they age. This advanced optical system:
- Maintains consistent 2900K color temperature throughout 5,000-hour rated life
- Eliminates color shift — no murky, greenish light as lamp ages
- Provides true color rendering (CRI 100) for accurate merchandise and artwork presentation
- Delivers focused 15° beam precision with smooth, even distribution
- Maintains 95% light output at end of life vs. 50% for standard dichroic lamps
Performance & Benefits
- UV Protection: Cover glass filters UV radiation—safe for sensitive materials and artwork
- Superior Color Consistency: ConstantColor® coating prevents greenish tint development
- High Beam Intensity: 3,750 CBCP provides concentrated, powerful illumination
- Long Life: 5,000-hour rated life exceeds standard MR16 lamps (2,000-4,000 hours)
- Precise Optical Control: 15° narrow spot beam with minimal spill light
- Universal Operation: Works in open or enclosed fixtures, any burn position
- Dimmable: Compatible with standard low-voltage dimmers
Professional Applications
- Museum artifact lighting
- Retail merchandise highlighting
- Hospitality feature lighting
- Architectural accent lighting
- Gallery display systems
- Track and recessed fixtures
Critical Safety Requirements
- For use in enclosed fixtures only (or open fixtures with proper safety screening)
- Allow 15-minute cooldown before handling — lamp operates at high temperatures
- Inspect glass envelope before installation — do not use if scratched or broken
- Dispose in sealed containers — contains pressurized gas
- Keep flammable materials 12+ inches from fixture — fire hazard
- Turn power off before installing or removing — electrical shock hazard
Certifications & Standards
- UL Listed
- CE Compliant
- RoHS Directive 2011/65/EU
- ANSI C78.1430-2017
* 5,000-hour rating based on 50% dimming usage
* Requires compatible 12V magnetic or electronic transformer
* Verify dimmer compatibility for electronic low-voltage systems
