Product Overview
Philips PL-T 42W/835/4P/ALTO — 42W Triple Tube CFL, 3500K Natural White, GX24q-4 4-Pin
The Philips PL-T 42W/835/4P/ALTO is a 42-watt triple-tube compact fluorescent plug-in lamp from Philips Lighting, designed for commercial downlights, recessed ceiling fixtures, wall sconces, and high-ceiling applications. With a GX24q-4 4-pin keyed base, 3500K natural white color temperature, CRI 82, 3,200 initial lumens, and a rated life of 12,000–20,000 hours on electronic ballasts, this lamp delivers high-output, energy-efficient illumination for offices, retail, hospitality, and institutional environments. ALTO low-mercury design — TCLP compliant. Requires a high-frequency electronic ballast — will not operate on magnetic ballasts or unballasted line voltage. Verify base type and ballast compatibility before ordering.
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Wattage
42W
Triple Tube CFL
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Lumens
3,200 lm
Initial Output
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Color Temp
3500K
Natural White
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Base
GX24q-4
4-Pin Keyed
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Rated Life
12–20K hrs
Electronic Ballast
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Technical Specifications
| Brand | Philips Lighting |
| Series | PL-T ALTO Low-Mercury |
| Philips Order Code | 14902-1 (alt: 43347-4 / 26873-0) |
| Model | PL-T 42W/835/4P/ALTO |
| Industry Ordering Abbreviation | CFTR42W/GX24q/835 |
| Lamp Type | Compact Fluorescent — Triple Tube (3U) |
| Wattage | 42W |
| Initial Lumens | 3,200 lm |
| CRI | 82 |
| Color Temperature | 3500K Natural White (835) |
| Base Type | GX24q-4 (4-Pin Keyed) |
| Ballast Requirement | High-frequency electronic ballast — 42W 4-pin |
| Burn / Operating Position | Universal |
| Rated Average Life | 12,000–20,000 hours |
| Max Overall Length (MOL) | 6.375" (162mm) |
| Ecologic Compliance | TCLP compliant — ALTO low-mercury design |
Product Overview
The Philips 14902-1 PL-T 42W/835/4P/ALTO is the highest-wattage lamp in the standard PL-T family, delivering 3,200 initial lumens at 3500K natural white for commercial and institutional environments requiring high lumen output in a compact triple-tube form factor. The 3500K color temperature is positioned between warm white (3000K) and cool white (4100K) — neutral and professional without appearing clinical, making it widely specified for offices, retail, hospitality corridors, and lobbies.
The GX24q-4 keyed base is mechanically keyed for 42W fixtures only — it will not seat in GX24q-3 sockets (used for 26W and 32W PL-T lamps), preventing cross-wattage installation errors. This lamp requires a high-frequency electronic ballast and will not operate on magnetic ballasts or directly on line voltage. ALTO low-mercury design passes TCLP federal testing requirements.
Compatible Applications
- Commercial recessed downlights and high-ceiling fixtures — High-output 42W source for larger fixture cavities requiring GX24q-4 4-pin lamps.
- Retail, office, and hospitality lighting — 3500K neutral white for professional environments where color balance and lumen output are both important.
- Wall sconces and architectural luminaires — Commercial and institutional fixtures requiring high-output compact CFL sources.
Before Ordering — Verify
- Base Type: Confirm the fixture socket is stamped GX24q-4. This base is keyed for 42W lamps only and will not fit GX24q-3 sockets (26W/32W). Confirm the socket designation before ordering.
- Ballast: Confirm the fixture uses a high-frequency electronic ballast rated for 42W 4-pin operation. This lamp will not operate on magnetic ballasts or unballasted line voltage.
- Color Temperature: Confirm 3500K natural white is appropriate for your application.
- Physical Fit: Confirm 6.375" MOL fits within your fixture's lamp cavity.
Cross Reference
- Sylvania CF42DT/E/835
- GE F42TBX/835/A/ECO
- Replaces discontinued Philips 26875-5
Safety and Handling Guidelines
- Electronic Ballast Required: Never connect directly to line voltage without a compatible electronic ballast — immediate lamp failure and electrical hazard will result.
- Mercury Content: Contains mercury (ALTO ultra-low). Do not dispose of in regular trash. Recycle through an approved lamp recycling program. Visit lamprecycle.org for local options.
- Allow Cooling: Allow lamps and fixtures to cool before servicing or relamping.
Compliance
- ALTO design — TCLP compliant, low-mercury.
- Contains mercury — subject to applicable lamp recycling and disposal regulations. This product cannot be shipped to CA, CO, HI, ME, MN, OR, RI, or VT due to state mercury lamp regulations.
- Verify RoHS and additional compliance requirements with the Philips manufacturer specification sheet.
Ordering Information
- Brand: Philips Lighting
- Series: PL-T ALTO
- Philips Order Code: 14902-1
- Wattage / CCT: 42W / 3500K Natural White
- Base: GX24q-4 4-Pin
- Packaging: Sold individually.
- Case quantities and bulk pricing: Contact ADL Supply for volume orders.
For wholesale pricing, bulk availability, or help confirming the correct replacement lamp, contact ADL Supply at 1-800-235-3489.
