Product Overview
GE 29486 CMHPAR20FL20 20W PAR20 Ceramic Metal Halide - 3000K 25° Flood - ANSI M156
The GE 29486 Pulsearc CMH PAR20 is a high-performance 20W Ceramic Metal Halide flood lamp featuring a standard E26 screw-in base and ANSI M156 ballast compatibility. Designed as a direct retrofit for 50W-75W halogen PAR20 lamps, this Constant Color CMH delivers 1,000 lumens of warm 3000K white light with 81 CRI and a precise 25° flood beam. With exceptional 12,000-hour rated life and open fixture rating, it provides superior energy savings and color stability for retail, hospitality, and architectural accent lighting.
Technical Specifications - GE CMH PAR20 20W
Product Identification
| Manufacturer Part Number | 29486 |
|---|---|
| Product Code | CMHPAR20FL25 (also CMHPAR20FL20) |
| UPC Code | 043168294867 |
| Technology | Pulsearc Ceramic Metal Halide (CMH) |
| Series | Constant Color with UV Control |
Electrical
| Wattage | 20 Watts |
|---|---|
| Base Type | E26 Medium Screw (Standard) |
| ANSI Ballast Code | M156 / M156/O |
| Voltage | 120V (via M156 ballast) |
| Burning Position | Universal (Any) |
Photometric & Physical
| Color Temperature | 3000K (Warm White) |
|---|---|
| CRI | 81 (Very Good) |
| Initial Lumens | 1,000 lm |
| Beam Angle | 25° Flood |
| Bulb Shape | PAR20 (2.5 inch diameter) |
| Maximum Overall Length (MOL) | 3.6 inches (91mm) |
| Diameter | 2.5 inches (64mm) |
| Rated Life | 12,000 Hours |
| Fixture Rating | Open or Enclosed Fixtures |
⚠️ ANSI M156 Ballast Required
Critical: This is NOT a line-voltage lamp that screws into standard sockets. It requires a specific ANSI M156 ballast (20W CMH rated). Using in a standard E26 socket without proper ballast will destroy the lamp and create safety hazards.
Compatible Ballast Information:
- ANSI Code: M156 or M156/O (20W Ceramic Metal Halide)
- Ballast Type: Electronic or magnetic HID ballast specifically rated for 20W CMH
- Common Applications: Retrofit kits for existing PAR20 housings with integrated M156 ballast
- Not Compatible With: Standard 120V line voltage, M130 (35W), M139 (70W), or incandescent dimmers
25° Flood Beam Characteristics
The 25-degree flood beam provides optimal coverage for general accent and area lighting:
- Beam Spread at 8 feet: 3.5-foot diameter pool of light
- Beam Spread at 15 feet: 6.6-foot diameter coverage
- Center Beam Candlepower (CBCP): High intensity for punch-through ambient light
- Edge Transition: Medium-soft cutoff suitable for wall washing and general illumination
- Best Applications: Track lighting, recessed accent, wall washing, merchandise highlighting
PAR20 Size Comparison
| Size | Diameter | Best For |
|---|---|---|
| PAR20 (This Lamp) | 2.5 inches | 4-inch cans, small track heads, display cases |
| PAR30 | 3.75 inches | 5-6 inch cans, general downlighting |
| PAR38 | 4.75 inches | Outdoor floods, high ceilings |
Open Fixture Rating: Key Advantage
Unlike most Ceramic Metal Halide lamps that require enclosed fixtures, this GE CMH PAR20 is specifically rated for open or enclosed fixtures. This provides:
- Retrofit Flexibility: Can be used in open track lighting and exposed fixture designs
- Safety Integration: Built-in UV filtration and containment (from "UV Control" designation)
- Design Freedom: Suitable for architectural open-track systems where enclosed housings would be visually intrusive
CMH 20W vs Halogen PAR20: Performance Analysis
| Specification | GE 20W CMH (This Lamp) | 50W Halogen PAR20 | 75W Halogen PAR20 |
|---|---|---|---|
| Wattage | 20W | 50W | 75W |
| Lumens | 1,000 lm | 550 lm | 850 lm |
| Efficacy | 50 LPW | 11 LPW | 11.3 LPW |
| Life Hours | 12,000 hrs | 2,500 hrs | 2,200 hrs |
| Color Stability | Excellent (Constant Color) | Perfect | Perfect |
| Annual Cost* | $9.00 | $22.50 | $33.75 |
*Based on 3,000 hours/year at $0.15/kWh. Savings: $13.50-$24.75/year per lamp.
Retrofit Advantage: This GE CMH provides 80% energy savings vs 50W halogen with 4.8x longer life, while maintaining warm 3000K color temperature.
Optimal Applications for PAR20 CMH
Retail & Display
- Track lighting for merchandise spotlighting
- Jewelry and watch display cases
- Cosmetic counter illumination
- Window display accent lighting
- Boutique track systems (open fixture rated)
Hospitality & Commercial
- Hotel lobby accent lighting
- Restaurant mood and accent lighting
- Recessed 4-inch downlight retrofits
- Art gallery track systems (3000K warm white)
- Museum display lighting (UV controlled)
Architectural
- Wall washing (25° flood pattern)
- Accent lighting for textures and materials
- Landscape accent (suitable for enclosed outdoor fixtures)
- Cove lighting integration
Safety Information & Handling Instructions
⚠️ Burn Hazard
- Allow lamp to cool before handling (operates at high temperature)
- Do not turn on lamp until fully installed
- Lamp may shatter if broken - Do not use excessive force when installing
- Do not use lamp if outer glass is scratched or broken
⚡ Electric Shock & Fire Risk
- Do not use where directly exposed to water or outdoors without enclosed fixture
- Turn power off before inspection, installation or removal
- Keep combustible materials away from lamp
- Use fused or thermally protected M156 ballast
- Use only in fixture rated for this product
? Lamp Rupture Warning
- Do not exceed rated voltage (operates on ballast-provided voltage)
- Do not store flammable materials near or below lamp
- Do not turn on lamp until fully installed
- Do not use beyond rated life (12,000 hours)
- Use only properly rated ANSI M156 ballast
Frequently Asked Questions
Can I screw this into any standard light socket?
No. While this lamp has an E26 screw base for physical installation, it requires an ANSI M156 ballast to operate. It cannot be screwed into a standard household socket connected to 120V line voltage. This lamp is designed for fixtures with integrated M156 CMH ballasts (specialized track heads, commercial downlights, or retrofit kits). Installing without proper ballast will destroy the lamp immediately.
What makes this different from other CMH lamps that require enclosed fixtures?
This GE CMH PAR20 is specifically engineered with UV Control technology and thermal management that allows open fixture operation. Most CMH lamps emit dangerous UV radiation and operate under high pressure, requiring full enclosure for safety. This lamp's "Open or Enclosed Fixtures" rating makes it suitable for architectural track lighting and open-design fixtures where enclosed housings would be visually unacceptable. However, it still operates hot and requires safety clearances.
What is the difference between PAR20, PAR30, and PAR38?
The number indicates the diameter in eighths of an inch. PAR20 (this lamp) is 20/8" = 2.5" diameter, fitting 4-inch recessed cans and small track heads. PAR30 is 30/8" = 3.75", for 5-6 inch cans. PAR38 is 38/8" = 4.75", for outdoor floods and high bays. PAR20 provides focused accent lighting, while larger sizes provide broader area coverage. Always match PAR size to your fixture specifications.
Is 81 CRI good enough for retail jewelry display?
81 CRI is acceptable for general retail and provides good color rendering. However, for high-end jewelry where precise gem color assessment is critical (rubies, emeralds, fancy diamonds), 90+ CRI is recommended. For general merchandise, clothing, and mainstream retail, 81 CRI provides accurate color perception at a more economical price point than premium 90+ CRI CMH lamps. The 3000K warm white also enhances the appearance of gold and silver.
How do I know if my ballast is M156 compatible?
Check the ballast label for "ANSI M156" or "M156/O" marking, or look for "20W CMH" or "20W Ceramic Metal Halide" specifications. M156 is specifically for 20W CMH lamps. Do not use with M130 (35W), M139 (70W), or M98 (39W) ballasts. If replacing an existing lamp, check the old lamp's ANSI code. If installing new, verify the fixture specifications indicate 20W CMH compatibility. When in doubt, contact the fixture manufacturer.
