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The LED Authority

Philips 40W 6in Gap T12 Daylight White UBent Fluorescent Tube (Pack of 4)

SKU: 219931 | Ordering Code: FB40/DX/6  | UPC: 46677219932

$32.76  ($8.19 per Bulb)
Pack of 4
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Product Highlights

  • Estimated life of 16.4 years based on 3 hours use per day

Lighting Facts Per Bulb

Brightness 2250 lumens
Estimated Yearly Energy Cost $4.82
Based on 3 hrs/day, 11¢/kWh
Cost depends on rates and use
Based on 3 hrs/day16.4 years
Light Appearance
6500 K
Energy Used40 watts

Philips U-Bent T12 bulbs are used in ceiling fixtures where a lot of light is needed. The ALTO technology this bulb offers provides less mercury than traditional bulbs, making it more environmentally friendly. Daylight white color is often used when true bright white light is needed, for work spaces, or retail applications, for example.

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
40 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
T-12 U-Bent

Bulb Color

The color of the light produced by a bulb
Bulb Color
Daylight 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)

U-Bent Gap (in)

The distance between the legs of a U-Bent fluorescent bulb, measured from center to center.
U-Bent Gap (in)

Contains Mercury (Hg)

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



Perfect replacement & much brighter than the soft white version that had burned out. Fast shipping & great price.


Felton, PA


Exactly what we ordered and needed




New York, NY


Works great!


Great Bright light.

Building Maintenance



Blue Bulbs


Returned the bulbs immediately because of the unnatural blue light they gave off


St Cloud, Minnesota


Great lights!


Great lights. Easy to install. Works great!

You Light Up My Life!

Atlanta, GA


added the brightness we needed


These bulbs added the brightness we needed in a hallway that we've recently painted with a darker color. customer service is awesome! It's great to be able to call, speak almost immediately with a live person- AND that person knows the answers to your questions without having to transfer you!


Chambersburg, PA


Philips 40W 6in Gap T12 Daylight White UBent Fluorescent Tube

4.3 6


Q & A
What ballast do I use for this fixture ? Each fixture has two bulbs

Mark @swimwear

Here are 4 potential ballasts that should work with these bulbs. Depends on the voltage you are looking for. 120, 277 or multi-tap.


Is this buld as white as the Daylight Deluxe Bulb by Philips?


This bulb is the daylight deluxe version by Philips.

Product Support