Product Overview
GE 20858 ESX/CG ConstantColor Precise — 20W 12V MR16 Narrow Spot Lamp, 15° GU5.3
The GE 20858 ESX/CG ConstantColor Precise is a 20-watt, 12-volt MR16 narrow spot halogen lamp from GE Lighting, featuring a UV-filtered cover glass, GE's proprietary ConstantColor reflector coating, 15° narrow spot beam, CRI 100, and a rated life of 5,000 hours. With a GU5.3/GX5.3 bi-pin base, 2900K warm white color temperature, and 3,750 CBCP, this lamp delivers consistent, high-intensity concentrated illumination with stable color throughout lamp life. Compatible with standard low-voltage dimmers. Requires a compatible 12V magnetic or electronic transformer. Verify voltage, wattage, and fixture compatibility before ordering.
|
Wattage
20W
MR16 Halogen
|
CBCP
3,750 cd
Beam Intensity
|
Beam Angle
15°
Narrow Spot
|
Base
GU5.3
Bi-Pin
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Rated Life
5,000 hrs
Average Life
|
Technical Specifications
| Brand | GE Lighting |
| Series | GE ConstantColor Precise |
| GE Order Code | 20858 |
| Description / Model | Q20MR16C/CG15 (ESX/CG) |
| ANSI Code | ESX |
| Lamp Type | MR16 Halogen — ConstantColor Reflector |
| Wattage | 20W |
| Voltage | 12V AC/DC (Low Voltage) |
| Amperage | 1.67A |
| Filament | C-6 |
| Beam Angle | 15° Narrow Spot (NSP) |
| Center Beam Candle Power (CBCP) | 3,750 cd |
| Initial Lumens | ~375 lm |
| Color Temperature | 2900K Warm White |
| CRI | 100 |
| Base Type | GU5.3 / GX5.3 Bi-Pin |
| Face Design | UV-Filtered Clear Cover Glass |
| Burn / Operating Position | Universal |
| Rated Average Life | 5,000 hours* |
| Max Overall Length (MOL) | 47.6mm (1.875") |
| Bulb Diameter | 50.8mm (2.0") |
| Dimmable | Yes — compatible with standard low-voltage dimmers |
| Packaging | 20 per case |
| UPC / EAN | 043168992961 |
| Certifications | UL Listed, CE, RoHS (2011/65/EU), ANSI C78.1430-2017 |
Product Overview
The GE 20858 ESX/CG ConstantColor Precise is a premium MR16 halogen lamp engineered for professional lighting applications where color accuracy, beam precision, and long-term color stability are critical. The proprietary ConstantColor reflector coating prevents the yellow-green color shift that develops in standard MR16 lamps as they age — maintaining consistent 2900K warm white output and 95% of initial light output through the full 5,000-hour rated life, compared to approximately 50% for standard dichroic lamps.
The UV-filtered cover glass suppresses ultraviolet radiation, making this lamp safe for use near UV-sensitive materials including artwork, museum artifacts, fabrics, and merchandise. The 15° narrow spot beam delivers high-intensity concentrated illumination at 3,750 CBCP with minimal spill light — ideal for accent, highlight, and feature lighting applications requiring precise beam control. CRI 100 provides full-spectrum color rendering for accurate presentation of merchandise and artwork colors.
This lamp is the UV-protected cover glass version (20858). The open face version without cover glass is available as order code 20815. Both share identical electrical characteristics.
Compatible Applications
- Museum and gallery lighting — UV-filtered cover glass protects artifacts and artwork from UV radiation.
- Retail merchandise highlighting — CRI 100 and ConstantColor coating ensure accurate, consistent merchandise presentation.
- Hospitality and architectural accent lighting — Precise 15° beam for feature lighting in hotels, restaurants, and commercial interiors.
- Track and recessed fixture applications — Universal burn position fits standard low-voltage MR16 track heads and recessed fixtures.
Before Ordering — Verify
- ANSI Code: Confirm the existing lamp matches ESX.
- Voltage: Confirm the fixture operates at 12V (low voltage). A compatible 12V magnetic or electronic transformer is required.
- Wattage: Confirm the fixture and transformer are rated for 20W.
- Base Type: Confirm the socket matches GU5.3 / GX5.3 Bi-Pin.
- Beam Angle: Confirm 15° narrow spot is appropriate for your application. The open face version (20815) is available if cover glass is not required.
- Dimming: If dimming, verify compatibility with your specific low-voltage dimmer and transformer combination.
Safety and Handling Guidelines
- Do not touch the reflector or envelope with bare hands. Skin oils cause hot spots leading to premature failure. Use clean gloves or a lint-free cloth. If touched, clean with isopropyl alcohol before use.
- Allow cooling before handling: Allow at least 15 minutes after switching off before handling — this lamp operates at high surface temperatures.
- Inspect before installation: Do not use if the glass envelope is scratched, cracked, or damaged.
- Turn power off before installing or removing.
- Keep flammable materials at least 12 inches from the fixture.
- Dispose in sealed containers — lamp contains pressurized gas.
Ordering Information
- Brand: GE Lighting
- Series: ConstantColor Precise
- GE Order Code: 20858
- ANSI Code: ESX
- UPC / EAN: 043168992961
- Wattage / Voltage: 20W / 12V
- Base: GU5.3 / GX5.3 Bi-Pin
- Packaging: 20 per case.
- Case quantities and bulk pricing: Contact ADL Supply for volume orders.
*5,000-hour rated life based on 50% dimming usage. Requires compatible 12V magnetic or electronic transformer. Verify dimmer compatibility for electronic low-voltage systems.
For wholesale pricing, bulk availability, or help confirming the correct replacement lamp, contact ADL Supply at 1-800-235-3489.
