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The LED Authority

Philips 15W 24in T8 Cool White Fluorescent Tube

SKU: 391086 | Ordering Code: F15T8/CW/ALTO (24 inches)  | UPC: 46677391089

$11.49 per Bulb
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Product Highlights

  • Estimated life of 6.8 years based on 3 hours use per day

Lighting Facts Per Bulb

Brightness 1035 lumens
Estimated Yearly Energy Cost $1.81
Based on 3 hrs/day, 11¢/kWh
Cost depends on rates and use
Based on 3 hrs/day6.8 years
Light Appearance
4100 K
Energy Used15 watts

Philips brand T8 fluorescent. 15 Watts and 24" for use in undercabinet fixtures. ALTO technology uses less mercury for an environmentally safer lamp.

  • Cool white color popular in many kitchens

  • Performance - well known brand name product at competitive price

Full Specs


Philips Lighting

Product Line


Model Number


Energy Used

A rating, expressed in watts, to indicate the rate at which a lamp consumes energy. Also known as wattage value.
Energy Used
15 Watts


The end (or ends) of the lamp that fits into the socket.
Medium Bipin

Bulb Shape

The description of the general appearance of a lamp/bulb consists of a letter(s) followed by a number. The letter indicates the shape of the bulb and the number relates to the diameter of the bulb in eighths of an inch. For example, a common household bulb is the A-19. The bulb is "A" shape and the diameter would be nineteen 8ths of an inch, or 2 3/8".
Bulb Shape

Bulb Color

The color of the light produced by a bulb
Bulb Color
Cool White


Color Rendering Index is an international system used to rate a lamp's ability to render object colors. The higher the CRI (based upon a 0-100 scale) the richer and more accurately colors generally appear. CRI differences among lamps are not usually visible to the eye unless the difference is more than 3-5 points.

Color Temperature (Kelvin)

An expression of the hue of the light emitted, measured in degrees Kelvin. Usually expressed by a four digit number followed by (k), such as 2700k. Higher temperatures indicate whiter, "cooler" colors, while lower temperatures indicate yellower, "warmer" colors. Some common Kelvin temperature benchmarks are 2700k (warm white), 3500k (neutral white), 4100k (cool white), 5000k (bright white), and 6500k (daylight).
Color Temperature (Kelvin)

Brightness (Lumens)

A rating of the initial light output of a bulb, rated after 100 hrs of operation. Lumens are a measure of how much light falls on one square foot of area, one foot away from the light source.
Brightness (Lumens)

Bulb Finish

The surface finish of a bulb, which may affect the quality of the light emitted.
Bulb Finish

Bulb Technology

The technology implemented by the bulb, e.g. incandescent, halogen, LED
Bulb Technology

Average Rated Life (hr)

A measurement of the average length of time, between first use and the point when 50% of the lamps tested have stopped functioning, , using an operating cycle of 3 hours on, 20 minutes off.
Average Rated Life (hr)

Length (in)

Also referred to as "Maximum Overall Length" (MOL). For light bulbs, it measures the length of a light bulb, from the top of the bulb to the bottom of the base or pins and is typically expressed in inches. For light fixtures and ballasts, it applies to the total horizontal length of the item.
Length (in)

Diameter (in)

Light bulbs: a measurement of a bulb's width taken at the widest point of the bulb. Fixtures: the measurement across the widest point of a circular fixture.
Diameter (in)

Contains Mercury (Hg)

Contains some level of the element Mercury. Typically, bulbs containing Mercury display the symbol 'Hg'.
Contains Mercury (Hg)

Osram Sylvania

An Osram Sylvania brand-specific product number for an equivalent item and is provided for the purpose of cross-referencing.
Osram Sylvania
23014 - F18T8CW/K24
Customer Reviews

great overall


Good availability of a less common size/watts... good price... good transaction


Long Island, NY

Just what I needed to get undercounter light working again!


Under counter kitchen light is not normal size and this is the original makeand size. I was so happy to find it available because I leave this light on 24/7. The light is bright and keeps kitchen lit so other lights do not have to be turned on if coming in for a beverage or something out of refrigerator.


East Canton, OH


This works


I needed an unusual size and unusual wattage; the electrician doubted I could find the bulb and recommended replacing the fixture. A web search led me quickly to you. This is the first time I've had to replace bulbs since the fixture was installed 10 years ago. I wish the color of the light were warmer, but that is a small complaint about a bulb that solved a big problem.




Philips 15W 24in T8 Cool White Fluorescent Tube

4.7 3


Q & A
Can I use 17 watts 24 in. T 8 in place of 15 watts 24 in. T 8 ? Thank you.


That would depend on the configuration of your ballast for the fixture. Please contact Customer Service at 888-455-2800 for further assistance.


Hello, Why is this 15 Watt, 24-inch fluorescent bulb so high ($11.99 ea.)? Gosh, when looking at any of the other sizes, they cost less than $5 each. Is there a different brand I could use that doesn't cost so much? Then, having to add shipping and state taxes on top of this price makes matters worse. With everything factored in, it's costing me $33 for two bulbs! I'm thinking it would be cheaper, in the long run, to replace the entire unit. Appreciate any recommendations you can make. Thank you. Nancy Kovaleski


It's most likely because Philips is a premium brand. We carry other options in 17 and 18 watt versions. What is the max. wattage for your fixture/ballast? Please contact Customer Service at 888-455-2800 for further assistance.