Sylvania F48T12/CW/HO T12 High...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$15.36
Sylvania F48T12/CW/HO T12 High Output Fluorescent Lamp

Sylvania F48T12/CW/HO T12 High Output Fluorescent Lamp

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Model: 20929

In Stock (leaves warehouse same day if ordered before 3pm ET)

$15.36
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Sylvania F48T12/CW/HO T12 High Output Fluorescent Lamp

The Sylvania F48T12/CW/HO family covers T12 High Output fluorescent lamps built for demanding commercial and industrial lighting applications where higher light output is required from a standard T12 form factor, available across model options 20929 and 25146 to support ongoing maintenance of existing High Output T12 fixture systems. Lamps in this family are rated at 60-Watt and deliver 4050 lumens with a 60 CRI and a 4200K color temperature, producing bright, cool-white illumination suited to warehouses, garages, workshops, and other large-format interior spaces. Each lamp uses a Recessed Double Contact base, matching it to fixtures designed for High Output T12 sockets, and a 48-inch length that fits standard 4-foot fluorescent fixture bodies. As a T12 High Output design, these lamps draw more power than a standard-output T12 lamp of the same length in exchange for significantly higher lumen output, making the family a practical solution when existing HO fixtures need consistent, code-compliant replacement lamps rather than a full retrofit. Facility managers and electrical contractors specify this family when maintaining legacy T12 HO lighting systems that are not yet ready for LED conversion, ensuring continuity of light levels and color rendering across a lit space, with an average rated life of 12000 hours per lamp.

Key Features

  • Lamp Length: 48-Inch overall length for direct fit in standard 4-foot High Output fluorescent fixtures.
  • Wattage: 60-Watt High Output rating delivers greater brightness than standard T12 lamps of the same length.
  • Light Output: 4050 initial lumens for strong, consistent illumination in large interior spaces.
  • Color Temperature: 4200K cool-white color rendering suited to task and general area lighting.
  • Color Rendering: 60 CRI, typical of standard-grade T12 High Output fluorescent lamps.
  • Base Type: Recessed Double Contact base for compatibility with High Output T12 sockets and fixtures.
  • Lamp Type: T12 High Output fluorescent construction designed for HO ballast systems.
  • Rated Life: 12000-hour average rated life for dependable long-term service.

Technical Specifications

  • Product Type: Fluorescent Lamp
  • Product Wattage: 60W
  • CRI: 60
  • Product Subgroup: Bulbs
  • Product Diameter: 40.46 millimeters
  • Average Rated Life: 12000 hours
  • Bulb Type: T12
  • Color Rendering Index: 60 color rendering index

Typical Applications

  • Warehouse and Industrial High-Bay Fixtures
  • Commercial Garages and Maintenance Facilities
  • Legacy T12 High Output Fixture Retrofits and Maintenance
  • General Area and Task Lighting in Large Interior Spaces
  • Replacement Lamp Stock for Existing HO Fluorescent Systems

Why Sylvania?

Sylvania has long supplied dependable fluorescent lighting for commercial and industrial facilities, and the F48T12/CW/HO family continues that standard with High Output lamps engineered to match the performance expectations of existing HO fixture installations. With a defined 4050-lumen output, 4200K color temperature, 60 CRI, Recessed Double Contact base, and a 12000-hour rated life, this family gives facility teams a reliable, drop-in replacement option across model numbers 20929 and 25146 for maintaining consistent light levels without altering fixture infrastructure.

Manufacturer Resources

Product Specs

Product Type:
Fluorescent Tube
Product Wattage:
60W
Light Temperature:
4200K
Lumens:
4050
CRI:
60
Bulb Base:
Recessed Double Contact
Department:
Electrical
Product Group:
Lighting
Product Subgroup:
Lamps & Bulbs
list_batch:
SYL-20260928
Product Diameter:
40.46 millimeters
Base:
Recessed Double Contact
Average Rated Life:
12000 hours
Bulb Type:
T12
Color Rendering Index:
60 color rendering index

Sylvania 20929 – Frequently Asked Questions

1) Will the Sylvania F48T12/CW/HO work in my existing 4-foot fluorescent fixture?
Only if that fixture is a High Output T12 setup. The F48T12/CW/HO is 48 inches long so it spans a standard 4-foot fixture body, but it uses a Recessed Double Contact base and needs an HO ballast. Standard-output 4-foot T12 lamps use a medium bi-pin base, so they are not interchangeable with this one. Check the sockets: if they take the recessed double contact pin, you are in the right lamp.
2) Can a Philips 236794 T8 high output lamp replace a Sylvania F48T12/CW/HO?
No, not in the same socket without changing the fixture. The Sylvania F48T12/CW/HO is a T12 lamp, a 60-Watt high output tube with a Recessed Double Contact base and a 40.46 millimeter diameter. The Philips 236794 is a T8 high output lamp rated 44-Watt at 4100K from the Alto series. The T8 is a narrower tube on a different ballast and lampholder arrangement, so it is a fixture-level change rather than a lamp swap. For maintaining existing HO T12 sockets, the F48T12/CW/HO stays in the Recessed Double Contact prep.
3) Which lamp should I use when color rendering matters more than raw output?
The Sylvania F48T12/CW/HO is a 60 CRI lamp at 4200K, 4050 lumens, which is standard-grade rendering typical of T12 high output tubes and is aimed at warehouses, garages, and shops. If the space needs truer color - retail displays, inspection work, paint or print areas - the Philips 479634 Alto II is a high CRI linear fluorescent lamp and is the one specified for rendering-sensitive work. Note the Alto II is a T8-class linear lamp, so it is a different fixture and ballast platform, not a drop-in for an HO T12 socket.
4) What is the difference between the 20929 and 25146 models of the Sylvania F48T12 HO lamp?
Both order codes cover the same F48T12/CW/HO lamp: 60W, 4050 lumens, 4200K, 60 CRI, Recessed Double Contact base, 12,000 hour rated life. They are the two model options the family is sold under, so either will maintain the same light level and color in an existing HO fixture.
5) Will a 4200K lamp match the other fluorescent tubes already in my warehouse?
4200K reads as a cool white, close enough to the common 4100K commercial white that it will not look out of place in most mixed rooms, though a side-by-side run of 4100K and 4200K tubes can show a slight difference. Color rendering is 60 CRI, which is standard grade for T12 HO. If color fidelity matters more than output, a high CRI linear lamp like the Philips 479634 Alto II is the different direction, but it will not fit HO T12 sockets.
6) Is 4050 lumens enough for a warehouse or garage bay?
Each lamp puts out 4050 initial lumens at 60W, which is the High Output step above a standard 4-foot T12 of the same length. In warehouses, garages, and shops the fixtures are usually two or four lamp, so the real figure is 8,100 or 16,200 lumens per fixture. If the space is lit correctly today, replacing like for like with these keeps the levels where they are.
7) Should I keep relamping T12 HO fixtures or convert to LED?
Relamping makes sense when the HO fixtures and ballasts are still sound and you need light levels and color to stay consistent across a space. The F48T12/CW/HO drops straight into existing recessed double contact HO sockets with no fixture work. LED conversion means ballast bypass or fixture replacement, labor, and a change in appearance across any area you do not convert at once. Facility teams commonly stock these to hold legacy HO systems until a whole-area conversion is budgeted.
8) My fixtures are T12 HO but I want lower wattage per lamp - what are my options?
Within the same socket, the Sylvania F48T12/CW/HO is the 60-Watt high output T12 with a Recessed Double Contact base, and dropping wattage means changing the lamp platform rather than the tube alone. The Philips 236794 is a T8 high output lamp rated 44-Watt at 4100K, so a lower per-lamp wattage path runs through a T8 HO conversion of the fixture. If the fixtures are staying as they are, the F48T12/CW/HO keeps the 4050-lumen, 4200K light level and the 12000-hour rated life consistent across the space.
9) How long do these Sylvania T12 HO lamps last before relamping?
Average rated life is 12,000 hours. On a two-shift schedule around 4,000 hours a year, that is roughly three years before a group relamp is due. Buying both the 20929 and 25146 codes against the same fixtures is fine since they are the same lamp.
How fast can I get the Sylvania 20929 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 Sylvania 20929 come with a warranty?
Absolutely. The Sylvania 20929 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 Sylvania 20929?
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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