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Product Overview:
  • Rocker switch installed
  • Cool white bulbs
  • Steel housing
  • CA Title 24 Compliant
  • Learn More

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Fluorescent T5 Thin-Inch Light Fixtures

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Fluorescent T5 Thin-Inch Light Fixtures

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About our Fluorescent T5 Thin-Inch Light Fixtures

These fluorescent T5 thin-inch under cabinet light fixtures are available in five sizes and come complete with lamps, electronic ballasts, and pre-installed rocker switches. These fluorescent fixtures are perfect for kitchen under cabinet task lighting, work stations in offices, hospitals, and laboratories, certain types of display cases and showcases, shelf lighting, exhibits, merchandising, and bars.


  • 4 Models:

    Model# PTISL-
    Wattage 8 watts 13 watts 21 watts 26 watts
    Lumens 320 lumens 700 lumens 1020 lumens 1400 lumens
    Length 12-1/8in 21.25in 33-3/8in 42-3/8in
  • Low Profile: only 1in thick by 5in wide
  • Steel Housing: die-formed housing made of cold rolled steel with a baked white enamel finish
  • Flexible Polycarbonate Diffuser: flexible, one piece, extruded, ribbed, white polycarbonate diffuser
  • Complete Fixture: supplied with
    1) T5 cool white fluorescent lamp(s),
    2) T5 electronic ballast,
    3) a pre-installed rocker switch, and
    4) a Cable connector for hardwiring.


  • Fluorescent Light Bulbs Are Included: fluorescent T5 lamp(s) (5/8in in diameter) are included
  • Cool White Light Bulbs: color temperature of 4100K (cool white)
  • Lumen Ratings: 8W light bulb produces 320 lumens of light; 13W light bulb produces 700 lumens of light
  • Good Lamp Life: rated life is 10,000 hours on average (Lamp is easily replaced.)
    [Caution: always be certain that the light bulb is seated properly in both of its sockets. Be sure that both pins of each end are inside their respective socket and that the light bulb is rotated 90 degrees once the pins are in the sockets. Failure to make good electrical contact between the pins and its socket may result in arcing and excessive heating of the socket.]


  • Quiet Electronic Ballast: lightweight electronic ballast provides instant-on starting with no flickering and cool quiet operation (less heat, less weight, less noise, & lower wattage than a magnetic ballast)
  • Energy Efficient: uses only 8, 13, 21, 26 watts of power/fixture respectively (Uses 70% less energy than incandescent lights of equivalent wattage.)
  • CA Title 24 Compliant: this thin-inch under cabinet light meets California Title 24 strict energy-efficient requirements
  • On/Off Rocker Switch: an on/off rocker switch is pre-installed
  • Switching: when these fluorescent under cabinet task lights are linked together, an individual fixture may be adjusted by the on/off fixture switch without affecting the other fixtures. Additionally, if multiple fixtures are hardwired to power, then they may be controlled by a single wall switch as long as the rocker switch on each fixture is left in the “on” position.
  • Not Dimmable: these fluorescent fixtures are not dimmable


  • Easy to Install: please refer to these Installation Instructions (PDF). [Caution: Always check local electrical codes and the National Electrical Code (NEC) before installing any lighting products. It is also wise to consult with a licensed electrician in your geographical area about any electrical details that you might have questions about and to make certain that you are satisfying all of the appropriate electrical codes.]
  • Easy to Wire: may be “hard-wired” directly to power source using multiple 1/2in knockouts at the rear of the fixture, the "top" of the fixture, or the two ends of the fixture.
  • Easy to Connect Multiple Fixtures Together: multiple fixtures can be "daisy-chained" together. One standard household 14/2 wire between each fixture completes the parallel circuit.


  • Large Quantity Discount: If you would like us to quote on a large quantity of Fluorescent T5 Thin-Inch Light Fixtures, please call us at our toll-free number or use the online Quotation Request for Large Quantities form.  We are always happy to provide you with our best large quantity pricing.

    UL Listed  1-Year Warranty  Satisfaction Guarantee  Quick Ship Item  CA Title 24 Compliant

Product Reviews
Fluorescent T5 Thin-Inch Light Fixtures
4.5 Stars based on 73 Review(s)
Jeffrey Jacks
Alturas, California
5 Stars
I would recommend this item to a friend.

Just what I needed
September 28, 2013
These little lights give really Big performance. Perfect under cabinet (or) under shelf lighting with minimal power consumption and plenty of soft light. Experience with Pegasus Lighting was exceptional. Quality products, fast shipping and great service!

United States
5 Stars
I would recommend this item to a friend.

Fluorescent T5 Thin-Inch Light Fixtures
August 29, 2013
Bought three (12 inch) for kitchen undercabinet. Great lights. Have already placed order for more now that I have seen the product. (Do-it your-selfer)
Quality and price
Agree with previous comment about not much room to store the wires, but the ballast can slide to the left or right to make more room.

Ann Arbor, MI
5 Stars
I would recommend this item to a friend.

High Quality, Low price, Good quick service
August 5, 2013
Lamp met my expectations. It is high quality.
Quick delivery, low cost. Quick start ballast.
Wish there was a "no switch" option - but a small matter. Also wish I could choose color temp of bulb, but easy to swap out bulbs.

John T.
Pasadena, California
5 Stars
I would recommend this item to a friend.

Quality seems excellent after one month's use
August 4, 2013
Purchased two 42" fixtures to replace a pair from Home Depot that had died -- one, after about 7 years; the other, after 13 years of use. In each case, of course, it was the electronic ballast that failed, and finding compatible ballasts was a dead end. Especially since original manufacturer seems to have gone out of business. In any case, these were a fairly easy replacement, even though both lights are hardwired in place; and the light output is as good or better than previous T5 fixtures. I'll buy these again if any of my other fixtures fail.

Charlotte, NC
5 Stars
I would recommend this item to a friend.

Needed light for my office desk hutch
July 8, 2013
Needed light over my office desk hutch. My wife and I have a home business where we are constantly at our desk. We have a matching set of desks with hutch. Her's is a 72 in desk & mine a 60 in, both with overhead hutch for storage. We bought a nice pair of hutch lights for her's, which work great, from the desk manufacturer. Rather pricey. I ordered the Fluorescent Thin-Inch 26 watt 42 3/8in for half what her's cost. Connected a power cord in it, mounted it under hutch, was the perfect light. Now my wife says she likes mine more than hers. When hers give out, will buy another one just like mine. Very well built light and easy to install.
Ease of installation. Quality built. Thinness is a plus. Looks great. Great price.

Palo Alto, CA
5 Stars
I would recommend this item to a friend.

Thin is in!
February 18, 2011
I placed several of these lights in my new closets and they provide just the right amount of light for small spaces.
Barely visible, easy to install, priced just right.

4 Stars
I would recommend this item to a friend.

Worked well for 4 years but why no outlet option???
September 1, 2015
Bought 6 of these 4 years ago and they have worked fine ever since. I rarely use the rockers since I hardwired them in series (4 on one wall switch and 2 on another). I like the low profile so they protrude below the cabinet edge only about 3/16". I just bought another one to replace a slightly different model with an outlet (and was not as wide) that is no longer carried here. Not sure if it was the ballast (couldn't find a small enough replacement) or a short because of the very cramped wiring, but the light stopped functioning a while back. Even though the manufacturer of these units offers an outlet option, Pegasus doesn't carry it for some reason so I scavenged the outlet from the old one and put it into this one so we have a light for our island again.
Low profile
No electrical outlet option.

Forestville, CA
5 Stars
I would recommend this item to a friend.

Just what i was looking for.
August 3, 2015
Fast shipping great packaging.

Atlanta, GA
5 Stars
I would recommend this item to a friend.

Great Service
June 29, 2015
This is a small, simple fluorescent fixture and exactly what I needed in the space. The description fits the item perfectly. Very quick delivery from Pegasus.
Exactly as described, exactly what I needed.

Metairie, Louisiana
5 Stars
I would recommend this item to a friend.

Better than expected
June 27, 2015
I received the under cabinet fluorescent lighting sooner than I expected; further, I was able to install it as a replacement in very short order. The fixture is absolutely perfect for my needs; I'll buy more from Pegasus if the opportunity arises.
Great value for the money; terrific supply chain management.
Absolutely none.

Questions & Answers
By Jeff in Dallas from Dallas on October 24, 2013
I'm assuming the 42 3/8 fixture takes 2 21-inch 13-Watt T5 bulbs? I'm replacing a 42.5" fixture that takes 2 21-inch 13-watt T5 bulbs.
By Jacob from Pegasus Lighting on October 25, 2013


That's correct. The 42in fixture takes 2 13W T5.

By Camp from Washington, DC on February 18, 2014
To confirm the bulb configuration of 24.5inch model is 2 12-inch T5's?
By Jacob from Pegasus Lighting on February 19, 2014

Yes, it uses two 8W 12in T5 light bulbs.

By Bill Jordan from on April 23, 2015
Does the 33" fixture use a single bulb?
By Jacob from Pegasus Lighting on April 24, 2015

No, it uses 2 - an F13T5 and an F8T5.
By Ned from Inverness, FL on April 24, 2015

They have two thin bulbs. All the fixtures are very nice.

By Richard Schmitt from 04105 on May 31, 2014
Your Fluorescent Thin-inch Light Fixture, PITSL 240EXSB, specifies a 24 inch 16 watt T5 bulb. I do not believe that there is a 16 watt T5 fluorescent bulb and you do not list one on your website. There is, however, a 16 watt T4 bulb. Which is correct?
By Ila from Pegasus Lighting on June 2, 2014


You are correct, there is no 16-watt T5 lamp. The 16W fixture uses two 8-watt T5 lamps.

By Jim from Thousand Oaks, CA. on February 24, 2014
What is the width of this item?
By Jacob from Pegasus Lighting on February 25, 2014

5in wide

By Chuck from Boone, NC on February 18, 2015
Do you have a grow bulb that would go in this fixture?
By Ila from Pegasus Lighting on February 19, 2015


The manufacturers don't claim the lamps as "grow bulbs," however most home growers do use the standard lamps for that purpose. The experts claim the growing results are the same when using either a standard fluorescent lamp or a costly full spectrum grow lamp and therefore use the standard lamp with kelvin temperatures between 4000 and 6000K that mimic daylight well.

Hope this helps!

By Steven Lopez from Durham, NC on September 7, 2012
Does this come in 277V?
By Jacob from Pegasus Lighting on September 7, 2012


No, it is 120V only

By Bob Hanes from Brighton MO on August 11, 2013
What is the distance from the end to the back knockout, if it is the center what is the total length of the fixture?
By Jacob from Pegasus Lighting on August 12, 2013

There are 3 knockouts on each fixture.

One knockout is in the center. See the models table in the description for the exact length of each size.

Two knockouts are on the ends. They are 1-11/16in from the edge of the fixture.

By Garth from Dallas on October 2, 2014
Do these fixtures incorporate a replaceable "starter" as did T5 fluorescent of the 1990's?
By Jacob from Pegasus Lighting on October 3, 2014

Garth, no, this fixture does not have a replaceable starter.

By Barb from NJ on December 21, 2013
I have 4 24 "cabinets right next to each other.
Are these linkable?
By Jacob from Pegasus Lighting on December 22, 2013

Yes, they can be linked together using standard 14/2 household wire.

By Frances Wehmeier from Cheney, KS on January 9, 2015
How do I get to the ballast so I can replace it?
By J from La Canada, CA on January 9, 2015

Remove the plastic diffuser and bulb(s), then squeeze the metal panel that houses the bulb-holders and switch. You should see 1 or more raised tabs behind the bulb into which the thin steel of that panel slides to keep the two parts of the housing together. Once you squeeze the panel, you should be able to pop the thin edge out of the raised tabs, then the panel will easily "hinge" open. The wire connections inside are crimped caps, not too hard to uncrimp; or you could just cut off and replace with new ones -- assuming you can find a replacement ballast! I switched to this brand of T5 fixture when the previous manufacturer (purchased at Home Depot in 1999) went defunct. This brand is almost identical, except that for multi-tube fixtures this brand has one ballast per bulb, not merely just one per fixture.
By Joe Loyek from Scranton, PA on January 9, 2015

Remove the plastic translucent cover as well as the light bulb. You'll see that the wiring compartment is held in place by two small tabs punched into the mounting plate that is screwed to the bottom of your cabinet. Squeeze the compartment directly below the two tabs and it will release exposing the ballast and related wiring.
By Jim from San Clemente, CA on January 10, 2015

If I remember right, this fixture has an electronic ballast. Not being an electrician, I chose to just replace the complete fixture. I didn't think $18 was a bad price at all for this item.
By Terry from Dallas, TX on January 10, 2015

Ensure that the power to the unit is turned off. Remove the flexible plastic lens from the unit by pinching it out of the grooves using your thumb and fingers. Remove the two fluorescent light bulbs. Remove any screws that hold the unit to the cabinet. The ballast and wires are inside of the metal case and the cover is secured by three perforations in the unit, one on each end and one in the center. Use your thumb and fingers to squeeze the metal over the grooves. The ballast and wires are now exposed for replacement or repair.

By Chuck Higgins from San Diego, CA on October 28, 2012
Will the knockout accept two Romex cables plus a ground? What is the dimension of the knockout? Location?
By Jacob from Pegasus Lighting on October 29, 2012

There are multiple 1/2in knockouts located at the rear, top, and ends of the light fixture. I would suspect that being able to fit the cables will be determined by their exact cable size.
By Joey from Kingsland, TX on October 29, 2012

The factory knockout is 3/8". I will often drill a 7/8" hole where I want it and insert a black bushing and that will support two 12/2 Romex. It will be difficult to get both wires in the 3/8 hole but possible.
By JR from Clemson, SC on October 29, 2012

The fixture is 1" thick. There are three knockouts on the long fixtures, all on the back, each end and the middle. I think the middle one is larger than the ends, probably the full 1", while ends are maybe 3/4". Assuming use with non-metallic Romex® cable, #14 would work. #12 would be mighty crowded.
By John from Naples, FL on October 29, 2012

No. It will not. The dimension is about 1/2 inch diameter.
By Jim from Winston Salem, NC on October 29, 2012

We have installed with (2) 14/3 wires with no problem.
By David Watkins from Bel Air, Maryland on October 29, 2012

Yes, this is feasible. There is a larger knockout in the middle-back to allow placement near the back of a wall cabinet, with a plastic grommet included. There are 2 smaller knockouts on either end, as well, and they do accommodate Romex connectors. Use 14 gauge wire for connections, because of space limitations in the 1 inch housing.
By John Blizard, Installer for Vicki from Northern VA on October 29, 2012

I just installed two of these for a customer. The knockout is the standard size that will accept a 3/8" Romex cable connector and you can fit two 12/2 or 14/2 Romex connectors. There are several knockouts available-side, back. I had to use the one in the back. The metal connector supplied with the light is TOO SMALL FOR THE KNOCKOUT IN THE FIXTURE. In the one install I used a standard 3/8" NM cable connector, and the other light fixture came with a plastic grommet type knockout insert which fit and worked fine.

Hope this helps!
By Jeff B from Tulsa on October 29, 2012

These fixtures have 1/2 KO's that will accommodate 2 Romex cables with ground. I recommend using 16 gauge or less for flexibility. 12 gauge is very tough to work with in these thin fixtures.
By Donald from Bullard, TX on October 31, 2012

There are 6 knockouts. Each are 0.5 inches in diameter. Three are located along the back edge (left, right and center) and three on the top surface (left, right and center). Since my light is mounted in a tight space I cannot see if there are any more.
Hope this helps.
By Curtis from Syracuse, New York on October 31, 2012

There is a knockout at left and right ends and at the center of the back of the fixture. The knockout approximates the size of a penny. The Romex wire that supplies power to my fixture has a black, white and bare ground wire. This one Romex wire was able to fit into the knockout. Don't know why you will need two of these but the knockout is big enough to tightly fit two Romex wires.

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