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40 Watt, 48 Inch T12 Bright White Fluorescent Bulb

SKU: 266437 | Ordering Code: F40T12/ADV50/ALTO (DISC - Use 423897)

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Lighting Facts Per Bulb

Brightness 3250 lumens
Estimated Yearly Energy Cost $4.82
Based on 3 hrs/day, 11¢/kWh
Cost depends on rates and use
Based on 3 hrs/day21.9 years
Light Appearance
5000 K
Energy Used40 watts

Philips brand brighter, longer lasting, and more powerful T12 fluorescent lamp.  ALTO technology uses less mercury for an environmentally safer lamp.

  • Even more light and higher color rendering than the standard Philips 850 lamp

  • Extra long life - 20% longer life than standard T12

  • Bright white color and high color rendering means a brighter, more colorful space

  • Performance - well known brand name product at competitive price

Full case (30) only, priced per bulb

Full Specs

Product Details


Philips Lighting

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

Bulb Color

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


A General Electric brand-specific product number for an equivalent item and is provided for the purpose of cross-referencing.
23471 - F40/XL/SPX50
Q & A

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1 Question | 1 Answer
Displaying question 1
  • Q:

    how bright is a 40 w tube lamp?
    Asked on 7/10/2011 by dick from philippines

    1 answer



      The bulb has a 5000K color temperature that emits a bright white light, similar to natural light (low end of the daylight spectrum). It also produces 3,250 lumens.

      Answered on 7/11/2011 by Product Support from Bulbs.com
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