Product Overview
Philips 149039 PL-T 42W/841/4P ALTO - 42W Triple Tube Compact Fluorescent Lamp, 4100K Cool White, GX24q-4 4-Pin Base
The Philips PL-T 42W/841/4P ALTO (#149039, CFTR42W/GX24q/841) is a high-performance triple-tube compact fluorescent lamp featuring ALTO low-mercury technology. It delivers bright cool white light at 4100K with 3,200 lumens output and a rated life of 12,000–20,000 hours (depending on ballast and operating conditions). Designed for electronic ballasts, this energy-efficient CFL provides crisp, daylight-like illumination with excellent color quality and reduced environmental impact—ideal for commercial, office, retail, and institutional applications requiring high visibility and clarity.
Technical Specifications
| Wattage | 42W | Color Temperature | 4100K (Cool White / Daylight) |
|---|---|---|---|
| Lumen Output | 3,200 lm (initial) | CRI (Color Rendering Index) | 82 |
| Rated Average Life | 12,000–20,000 hours (typically 12,000–16,000 hrs standard; up to 20,000 with optimal electronic ballast and longer on-cycles) | Base Type | GX24q-4 (4-Pin Plug-In) |
| Maximum Overall Length (MOL) | 6-3/8 inches (162 mm) | ||
| Product Code / Ordering Code | #149039 (PL-T 42W/841/4P/ALTO or CFTR42W/GX24q/841) | ||
| Technology | ALTO® Low Mercury (~1.4 mg per lamp, EPA TCLP compliant) | ||
Product Features & Benefits
- Triple tube design for optimal light distribution and compact fixture compatibility
- High energy efficiency — up to 75–80% savings vs. equivalent incandescent lamps
- ALTO low-mercury technology for reduced environmental impact
- Instant-start capability with compatible electronic ballasts
- Maintains ~80% lumen output at 40% of rated life for consistent performance
- RoHS compliant and designed for long-term reliability
- Excellent lumen maintenance and stable color quality over time
Recommended Applications
- Commercial office lighting (troffers, recessed fixtures)
- Retail store fixtures and display lighting
- Hospitality environments (hotels, restaurants, lobbies)
- Educational facilities (classrooms, hallways)
- Healthcare environments and general indoor ambient lighting requiring crisp visibility
Important Information
- Requires compatible electronic ballast for optimal performance, flicker-free starting, and extended life
- Contains a small amount of mercury — proper recycling/disposal required (recycle where available)
- Standard versions not dimmable (check for dimming-compatible electronic ballasts if needed)
- CE certified, UL listed, and meets UL 935 safety standards
- ENERGY STAR qualified (model-dependent) and Title 20 compliant
High-output CFL for cool white, daylight-like lighting in professional spaces—delivers bright, clear illumination with eco-friendly design. These legacy CFLs are increasingly replaced by LED alternatives for longer life (25,000+ hours), no mercury, and superior energy savings.
