Philips Lighting 927910583550 ...
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$68.16
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Philips Lighting 927910583550 PL-T 18W/835/A/4P/ALTO 4-Pin CFL Lamp, 3500K, ALTO Low-Mercury

Philips Lighting 927910583550 PL-T 18W/835/A/4P/ALTO 4-Pin CFL Lamp, 3500K, ALTO Low-Mercury

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Model: 9.27911E+11
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$18.16
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Philips Lighting PL-T 18W/835/A/4P/ALTO 4-Pin CFL Lamp, 3500K, ALTO Low-Mercury

The Philips Lighting PL-T 18W/835/A/4P/ALTO is a 4-pin compact fluorescent (CFL) lamp rated at 18W with a 3500K color temperature that produces a neutral-white light output suited to general-purpose commercial and residential lighting. Built on the PL-T twin-tube compact fluorescent platform, this lamp combines "A" amalgam technology, which helps stabilize light output across a wider range of ambient operating temperatures than standard CFL lamps, with Philips ALTO low-mercury technology engineered to reduce the environmental impact of the lamp and support more responsible disposal and compliance objectives. The 4-pin (4P) base configuration is designed for use in standard PL-T compatible sockets and fixtures, making this an efficient, code-friendly replacement lamp for existing 4-pin CFL fixtures in commercial and residential lighting applications. Refer to the manufacturer specification sheet for complete photometric, dimensional, and performance data on this lamp.

Key Features

  • Wattage: Rated at 18W, this PL-T lamp is designed to deliver efficient light output while operating in compatible 4-pin CFL fixtures and ballasts.
  • Color Temperature: The 835 color code corresponds to a 3500K color temperature, producing a neutral-white light output suited to general-purpose commercial and residential lighting environments.
  • 4-Pin Base Configuration: The 4-pin (4P) base is engineered for use in standard PL-T twin-tube CFL sockets, supporting straightforward lamp replacement in existing fixtures without rewiring.
  • Amalgam Technology: The "A" amalgam designation indicates amalgam technology, which helps the lamp maintain more consistent light output across a wider range of ambient operating temperatures than standard CFL lamps.
  • ALTO Low-Mercury Technology: Philips ALTO technology is engineered to reduce the mercury content of the lamp, supporting more environmentally responsible disposal and compliance objectives for facilities and contractors.
  • PL-T Twin-Tube Platform: The PL-T twin-tube compact fluorescent design is built for compact fixture applications where space is limited but reliable, consistent light output is still required.

Technical Specifications

  • Refer to manufacturer documentation for complete technical specifications.

Typical Applications

  • Commercial Lighting Fixtures and Downlights
  • Compact Fluorescent Wall Sconces and Wallpacks
  • Replacement Lamp for Existing 4-Pin CFL Fixtures
  • Energy-Efficient Lighting Retrofits and Upgrades
  • Residential and Light Commercial Interior Lighting

Why Philips Lighting?

Philips Lighting's PL-T series pairs amalgam technology for stable, consistent light output with ALTO low-mercury technology for more environmentally responsible performance, giving electrical professionals a dependable, energy-efficient compact fluorescent lamp built for demanding commercial and residential lighting applications. As part of Philips Lighting's broader compact fluorescent lamp portfolio, the PL-T 18W/835/A/4P/ALTO is engineered to deliver consistent 3500K light output at 18W and straightforward replacement in standard 4-pin CFL fixtures.

Manufacturer Resources

Product Specs

Product Type:
CFL Lamp
Department:
Electrical

Philips Lighting 9.27911E+11 – Frequently Asked Questions

1) Will the Philips PL-T 18W/835 4-pin lamp work in my existing 2-pin CFL socket?
No. The PL-T 18W/835/A/4P/ALTO has a 4-pin base, and 4-pin lamps run on an external ballast in the fixture rather than the self-starting integral starter found in 2-pin lamps. The two bases are not interchangeable in the same socket. If your fixture takes a 2-pin twin-tube lamp, you need a 2-pin version, not this one. In a 4-pin PL-T socket it drops straight in with no rewiring.
2) Does this 18W CFL need a ballast, or does it run on line voltage?
It needs a ballast. The PL-T 18W/835/A/4P/ALTO is a 4-pin compact fluorescent lamp intended for compatible 4-pin CFL fixtures and ballasts, so the ballast lives in the fixture and must be rated for an 18W PL-T lamp. Putting it on a socket wired for direct line voltage, such as an LED retrofit socket, will not work.
3) What is the exact Philips part number and base type I should order to relamp 4-pin CFL downlights?
Order the Philips PL-T 18W/835/A/4P/ALTO, Philips order code 927910583550. It is an 18W twin-tube PL-T compact fluorescent with a 4-pin base, 3500K, amalgam, ALTO low-mercury. Note the wattage, base pin count, and the 835 color code all have to match what is in the fixture, since PL-T lamps come in other wattages and color codes that share the same body style.
4) What does the 835 in PL-T 18W/835 mean for the light color?
The 835 code breaks into color rendering and color temperature: the lamp runs 3500K, a neutral white that sits between the warmer 2700K/3000K lamps and cooler 4100K. If the other lamps in your building are 4100K or 2700K, this one will read visibly different, so match the color code across a space rather than mixing.
5) Why choose the amalgam version of the PL-T 18W for cold or enclosed fixtures?
The "A" in PL-T 18W/835/A/4P stands for amalgam. Amalgam holds light output more consistent across a wider range of ambient operating temperatures than a standard CFL, which is what makes it the pick for enclosed downlights that run hot and for sconces or wallpacks exposed to cold. A non-amalgam lamp in those spots dims off or takes longer to reach full brightness.
6) Can I use this 18W PL-T lamp on a dimmer?
Dimming a 4-pin CFL is a function of the ballast, not the lamp. The lamp itself is a standard 18W PL-T twin-tube for compatible 4-pin fixtures and ballasts, so it will only dim if the fixture already has a dimming CFL ballast wired to a compatible control. On a standard fixed-output ballast, run it full output.
7) What is ALTO on a Philips CFL and does it matter for facility disposal?
ALTO is Philips low-mercury construction, engineered to reduce the lamp's mercury content and support more environmentally responsible disposal and compliance objectives. For a property manager or MRO buyer relamping in volume, that is the relevant part: less mercury per lamp going into the spent-lamp stream. It is still a fluorescent lamp and should be handled under your normal lamp recycling procedure.
8) Where does an 18W PL-T twin-tube lamp typically get used?
Typical spots are commercial downlights and recessed cans, compact fluorescent wall sconces and wallpacks, and residential or light commercial interior fixtures. The twin-tube PL-T body is built for tight fixture cavities where a linear fluorescent will not fit but steady output is still needed, which is why it shows up in relamping and energy-efficiency retrofit work.
How fast can I get the Philips Lighting 9.27911E+11 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Philips Lighting 9.27911E+11 come with a warranty?
Absolutely. The Philips Lighting 9.27911E+11 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Philips Lighting 9.27911E+11?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
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