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Internet # 308641077

Model # 543413

Store SKU # 144859

40-Watt 4 ft. Linear T12 ALTO Fluorescent Tube Light Bulb Daylight (5000K) (2-Pack)

Includes 2 bulbs
$13.98
($6.99 /bulb)
  • T12 linear fluorescent ideal for residential and commercial use
  • Natural daylight appearance ideal for concentration and task work
  • T12 linear with ALTO technology minimizes mercury content
  • View More Details
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Product Details

About This Product

Philips Linear Fluorescent 40-Watt T12 is Daylight bulb (F40T12/Daylight/5000K) is ideal for use in kitchens, bathrooms, garages, basements or anywhere in your home where daylight is desired. It provides general room lighting, simulating a natural light and creating a lively environment. Philips Linear Fluorescent T12 light bulbs feature ALTO Lamp Technology.

Highlights

  • Brightness: 2500 Lumens
  • Estimated yearly energy cost: $4.82 (based on 3-hours/day, 11c/kWh, cost depend on rates and use)
  • Lasts up to 21.9-years (based on 3-hours/day), 20,000 Hours
  • Light appearance: 5000K (natural light)
  • Energy used: 40-Watt
  • Lumens per watt: 62.5
  • T12 bulb shape, medium bi-pin base
  • Contains mercury: yes (for more info on cleanup and safe disposal, visit: epa.gov/cfl)
  • For indoor, commercial and residential use
  • Ideal for indoor general lighting purposes for commercial and residential use
  • T12, bi-pin
  • The comparable Philips LED option, Internet # 308350356. Life: 32.9-year (based on 3-hour/day)
  • Return Policy

Product Information

Internet # 308641077

Model # 543413

Store SKU # 144859

Additional Resources

Shop All Philips
From the Manufacturer

Specifications

Dimensions

Product Diameter (in.)

1.5 in

Product Length (in.)

48 in

Details

Average Life (hours)

20000

Ballast Compatibility

Type A

Bulb Color

White

Bulb Finish

Frosted

Bulb Material

Glass

Bulb Shape

Linear

Color Rendering Index (CRI)

90

Color Temperature

Daylight (5000K)

Control Type

Switch

Dimmable Capability

Non Dimmable

Indoor/Outdoor

Indoor

Light Bulb Base Code

G13

Light Bulb Base Type

Medium Bi-Pin

Light Bulb Features

No additional features

Light Bulb Shape Code

T12

Lighting Technology

Fluorescent

Max. Operating Temperature (F)

113 °F

Number of Bulbs Included

2

Rated

Damp Rated

Returnable

90-Day

Volt (v)

120

Wattage (Watts)

40

Wattage Equivalence

40

Warranty / Certifications

Certifications and Listings

No Certifications or Listings

Manufacturer Warranty

See packaging

Questions & Answers

Which fluorescent bulb replaced the old ones, which were purchased back in 2015: UPC 046677422769 PLC4T12SW PLC 40W 4 FT T12 ALTO SW DX 2PK
BySep 21, 2026
1 Answer | 
Answer This Question

The correct replacement would be the 40w T12 bright white lamps which can be found at https://www.homedepot.com/p/Philips-40-Watt-4-ft-Linear-T12-Type-A-ALTO-Fluorescent-Tube-Light-Bulb-Bright-White-3000K-2-Pack-543439/308442095

By|Sep 25, 2026


    Are these bulbs good for use in garage with high humidity?
    ByJul 15, 2026
    1 Answer | 
    Answer This Question

    High humidity by itself is generally not a problem for a conventional F40T12 fluorescent lamp. These lamps have been used for decades in garages, workshops, and basements where humidity is often high. The glass tube is sealed, so moisture doesn't affect the lamp itself.

    By|Jul 18, 2026

      (1)

      What is different from Alto 34w bulb
      ByMar 20, 2026
      1 Answer | 
      Answer This Question

      The 34w 4ft T12 tube is meant to be an energy saver or eco version of the traditional 40w T12 4ft fluorescent tube. You can use the 40w T12 as a replacement for the 34w T12. Just note that the 40w tube will likely be a bit brighter.

      By|Aug 23, 2026

        (1)

        which florescent bulb gives white light I DO NOT want blue light
        BySep 30, 2025
        1 Answer | 
        Answer This Question

        I'd recommend either a bright white or a cool white color temperature for a nice white light. You can read up on the difference between color temperatures at https://www.homedepot.com/c/ab/types-of-light-bulbs/9ba683603be9fa5395fab90e1115f39

        By|Aug 23, 2026

          (1)

          does this lighjt rreplace Phiollips 25 watt worklight?
          BySep 17, 2025
          1 Answer | 
          Answer This Question

          If the old Philips Worklite is 48 in in length then yes this is the appropriate replacement

          By|Sep 18, 2025


            Current light: GE - florescent tube - 3000K - 40W - Mercury Does this light replace?
            ByAug 15, 2025
            1 Answer | 
            Answer This Question

            This is a 40w four foot T12 fluorescent tube at 5000K or Daylight color temperature. This would fit into the same fixture as your reference bulb, but note that there is a color temperature difference. The reference bulb is 3000K or bright white.

            By|Aug 18, 2025


              Will this replace a GE Ecolux w/starcoat F40 CWC 41 Eco 40 watt Utility bulb?
              ByAug 14, 2025
              1 Answer | 
              Answer This Question

              Yes! This is the correct replacement

              By|Aug 14, 2025


                Are these bulbs dimmable?
                ByAug 4, 2025
                2 Answers | 
                Answer This Question

                MOST Fluorescent fixtures are NOT dim-able, especially ones with an older mercury ballast. Dimming a Fluorescent tube doesn't allow it to light up properly, so it wouldn't give off decent lighting anyway. You could just switch to dimmer/lower temp tubes.

                By|Jan 26, 2026

                  This would be dimmable but you would need to ensure the ballast in the fixture is rated for dimming and that the fixture is controlled by a compatible dimmer switch.

                  By|Aug 7, 2025


                    Viewing 1-8 of 58

                    Customer Reviews

                    4.5 out of 5

                    • 4.5 out of 2,249 reviews
                    • 89% recommend this product
                    Filter by:
                    Showing 1-10 of 2,249 reviews
                    DONT BUY IT - MADE IN INDIA - THE END PRONGS BRAKE OFF
                    DONT WAIST YOUR TIME OR MONEY LIKE I DID …. THIS IS JUNK MADE IN INDIA - THE ENDS PRONGS BRAKE APART VERY EASY MAKING THE BULB USELESS - THE USA made bulbs that I replaced the ends won’t brake for nothing they are so much more better quality.
                    by
                      DANGEROUS
                      I bought 2 packages of 2 bulbs. Total 4 bulbs. Balch Springs Tx store. They only had 2 that appeared unopened or returned. They are VERY difficult to open its almost like shrink wrapped cellophane. AFTER opening them ALL & trying to install after handling my HANDS were BLEEDING from tiny glass shards & particles in the cellophane wrapping. TRIED to explain to the ON Line ROBOT & someone claiming to be a HUMAN. Said go BACK to STORE? Thats my & TIME & GAS & REQUIRES me to HANDLE it AGAIN.
                      by
                        I'm very proud of these lights and how it brighten up my kitchen. Love the same day delivery, that's a plus for me.
                        by
                        • Verified Purchase
                        1 found this review helpful
                        Excellent bulbs, easy to install and very bright. They really light up a room.
                        by
                        tube light bulb
                        Came broke and they woukdnt help unless I came to the store even though had pics. I would have came and bought then at the store if i could….. dont so business with them….
                        by
                          • Recommended
                          Works well. Nice lighting.
                          Works well. Nice lighting.
                          by
                          • Verified Purchase
                          • Recommended
                          1 found this review helpful
                          These Fluorescent Tubes claims to be Daylight. But the light is not pure daylight. It has a Pin...
                          These Fluorescent Tubes claims to be Daylight. But the light is not pure daylight. It has a Pinkish cast too it. I have a SYLVANIA Fluorescent Tube right next to the Philips and the SYLVANIA is much whiter and more like Daylight. I have also have trouble with the Philips Tubes starting in my holder. If you want true Daylight I would NOT recommend these Philips 40-Watt Linear T-12 Alto Fluorescent Tubes..
                          by
                          • Verified Purchase
                          6 found this review helpful
                          Have used this product before and found to be very reliable
                          Have used this product before and found to be very reliable
                          by
                          • Verified Purchase
                          • Recommended
                          3 found this review helpful
                          Great price, works perfect
                          Great price, works perfect
                          by
                          • Verified Purchase
                          • Recommended
                          1 found this review helpful
                          Purchased a box of 10, at $3/each. The bulbs were packaged well and the 6 I replaced were install...
                          Purchased a box of 10, at $3/each. The bulbs were packaged well and the 6 I replaced were installed and are funtioning.
                          by
                          • Verified Purchase
                          • Recommended
                          1 found this review helpful
                          Showing 1-10 of 2,249 reviews

                          Compare Key Features

                          current item

                          Product Snapshot

                          Ideal for general room lighting, this 4 ft. fluorescent tube simulates natural daylight and creates a lively ambiance.
                          Ideal for general indoor lighting, this 32W fluorescent bulb offers natural light and long lifespan (27.4 years).
                          Ideal for customers who want a vibrant 6500K daylight glow, ensuring long-lasting commercial or residential use.
                          Ideal for offices, garages, and workspaces needing reliable, cool white light. Provides 1900 lumens and up to 10, 000 hours of light.

                          Wattage

                          40
                          32W
                          40 Watts
                          30

                          Luminous Efficacy

                          62.5
                          90.6 lm/W
                          58.2 lumens per watt
                          63

                          Color Temperature

                          5000K
                          5000K (Daylight)
                          6500K Daylight Deluxe
                          4100K

                          CRI (Color Rendering Index)

                          90
                          82
                          90
                          80

                          Lifespan

                          20000 hours
                          30000 hours / 27.4 years
                          20, 000 hours (18.3 years)
                          10000 hours